Well, CleanLX has talked about the purchasing the car that suits your driving style.
You got to think about this as well, "What you plan on using it most for".
It seems the majority says to go for a 787B. Well, here's something to consider.the 787B is Quick, High RPM range (9000 Revs), and 690 HP. Yes it looks nice and is very low to the ground with its unique Rotary Engine. HOWEVER, if you were to peek at it's torque, it stands at a low 440lb/ft, somewhere around there.
I can help you classify many of the LMs. there are essentially 2 kinds in a braod sense. Compareable to the political Spectrum, there's and extreme left and right. In this case, the extreme's would be Endurance and Speed.
Endurance; Tires dont wear as fast, Gas consumption is less, overall Acceleration isn't the quickest.
Speed (alias "Maximum performance, with some downfalls); Tires tend to wear a fast rate, same with the gas consumption,Accel is good.
I didn't include a top speed because MOST of the LMs essentially the same top speeds. There are some that dont rack up with the Big Group. Some of these include:
-Mazda 787B
-Nissan R390 GT1
-Toyota 7
-Gillet Vertigo
There ARE a bit more, and some of these some slack the top speeds as with another, i.e the R390, its top speed lays somewhere with the Big Group yet can outrun a Toyota 7, or Gillet.
The Big Group is something i jsut made up to group the LMs that hold a great top speed. Some include:
-Toyota GT-ONE
-Minolta 88C-V
-Nissan R89C & R92CP
-Audi R8
-Bentley Speed 8
-Sauber C9 (one of the weakest in this list)
There are exceptions to some other cars that lay in between the enduro and Speed, meaning aren't the fastest nor the best in endurances, It's the "Medium" in Racing Tires.
If only i knew how to work Microsoft Excel, this explanation would be a WHOLE lot easier. Anyway, I almost forgot to put up a brief list of Enduro Vs Maxed Speed. I'll start with enduro's..
-Bentley speed 8
-Audi R8
-BMW V12 LMR
-Pescarolos
Some of the Top Performances;
-Minolta 88C-V
-Nissan R92CP & R89C
-Jaguar XJ-R9
Now what's in between:
-Sauber C9 (leans more to top performance, but its endurance is slightly greater than what's listed above)
-Toyota GT-ONE? (unsure but the same case, Speed>Endurance)
-AMG CLK-GTR LM (Enduro>Speed, great top speed but when it comes to ratios, the enduro is greater.)
Um i apologize for the small # of examples, i cant think much, it's morning...-_- gimme a break..
I also want to point out some other cars i haven't included.. Why? because these are the LMs and Group C you want to avoid investing into unless stated below. Why? I'll explain as i name 'em off,(these are in my opinion, so dont get offended in any way)
-Mazda 787B: As stated in the first paragraph, Lacks the torque to hit the top speed as compared to othercars like 88C-V and R92CP, yes quick accel, that's good.
-Toyota 7: Same as 787B, quick accel, not the greatest top speed.
I'd only recommend getting these cars for tracks that have more corners, turns(esp. tight corners where all the cars need to go a bit slower than normal, and/or short in length (varies). Try not to use this car for tracks where they are more straights than turns and or areas where the car must go fast. I'f you've played in Nurbgring, the toyota 7 smoked every other LM. Im pretty sure 787B can do the same as well.
Here are the ones i DEFINITELY dont want invested into:
-Nissan R390 GT1: Not the greatest Top speed, nor Accel, NOR endurance,
-Ford GT40: same case as R390
-Pagani Zonda LM: Same case as GT40 ( but looks niceee)
-Gillet Vertigo: Garbage( IMO), its an FR, meaning greatly unbalanced tire wear. Downforce is weak, can only reach 10/20, while the others go 63/88. That's why its one of the first cars to screw up and slide out on Nurbgring. not the greatest top speed, accel is pretty decent.. 8790RPM..
-BMW McLaren F1: You won't believe it, if you play the GT-All Stars, the McLaren is the prize car, yet its in the races as well. What's unbelieveable is that it never finishes first. Slow Accel, top speed, not sure of, but from the look of the stats, it's not capable of top speeds as great as the Sauber C9. This one is like another R390.
-Panoz Esperante: I dont know much about this car, simply because i dislike its look, and because i dont see the fellar very much on the roads...but i do remember it didn't meet the standards of Peak Performance. Endurance, someone's going to have to fill me in on that one.
-Suzuki Escudo (if anyone really uses it often):This loses to Panoz's overall stuff. Massive understeer,great tire wear, Tire consumption i haven't looked into that, can't keep up with LMs (like it used to in GT2 and GT3). I think this car has been nerfed to garbage, it's not great in rally either.
There are more cars i dont recommend investing into , but as i've said i can't think of them any more. I barely play GT anymore. and I know a lot of the cars stated arent purchaseable, this'll give you a broader range of where i'm getting at.
References:
-Several Arcade races done in Nurbgring
-Like the Wind Event (done over 5 times)
-Sarthe I and II Enduro
This is my Food of Thoughts.