Backtracking, but whoa whoa whoa wait a minute there oh indigo one!As you say, the interest in GT1/2 is... well... somewhat slim. It's now just a piece of history which, while we enjoyed it at the time, can't hold a candle to even GT4 in terms of physics, graphics or even playability. It may not be worth your time, let alone your money.
GT1, as a GAME, is by far the best in the series. I'd even be willing to say GT1 is the best game of all time. I can't get into GT4 the same way as GT1. GT1 may not have had the car selection or graphics or physics that the modern games so proudly flaunt, but it is indeed more of a game. I think PD as of late has forgot in some respects that Gran Turismo is a GAME, not real life. I mean, 24 hour endurance races? What? I find myself more entertained with GT1 by far. It has a solidity to it, great presentation (intro, bro ), and a beautiful quality of playability. Given a free week, I bet just about anyone could beat it. It also has a great replay value. While in GT4, after beating it, I'd imagine most people would just spend their time tuning cars, I could see someone picking up GT1 and playing through the entire game again. It's just that good.
Though of course, this is all just my opinion...