It is a pretty general topic, and its been 4 months, so I'll bump it.
My Favorite Tracks:
Grindelwald - I always forget about this place. For some reason it is only in GT2, and it is a shame. I would love to see the scenary significantly updated on a next-gen console, and Grindelwald is one the game's funnest courses. I love running Time Trials there in a GT40.
Seattle Circuit - It is obviously one of my favorites, if only for the fact I live there. But the Seattle Circuit is my favorite city track in the GT series, because it is such a fun course. Also the fact that with one small exception, this is all actual city streets makes it even better.
Red Rock Valley - A GT2 exclusive, this is one of the funnest tracks in the game. It is a fast course, and a hard one. The scenary isn't much to look at, but if they update this in a future GT game, I bet it will look a lot better. Also, here is where you can make $550,000 in under six minutes.
Midfield Raceway - Always a fun track in any game; this is my favorite GT course, period. It may be easy, but it has a great flow to it, and feels like a real race course. I remember when me and my brother had a best 14 of 27 tournament here.
Rome Night - A seldom raced-on course, it only appears in one Simulation Mode race, (Yes, it does appear, I remember it in a Renault Manufacture race, maybe Alfa Romeo, have to check) I consider it to be superior to Rome Regular, and like most people, I would love to see it in a future game.
So there is my first real post..... Hooray.