[quote name='mikon']GTR2 is a good bet, it is older, but has some features the newer series doesn't, like night races. It also has plenty of mods.
Race: Injection is a good second choice and it's a bundle that does include the base game Race 07 and a handful of expansions. Race 07 is slightly newer with a bit of a graphics update (but not much). To round out a Race 07 collection without buying the complete SimBin bundle, you could add Race On and GTR Evo (both Race 07 expansions).
If you ask different people, you'll get conflicting opinions on the feel of GTR2 compared to Race 07.
There is a GTR2 demo out there if you want to give it a try:
http://www.gamefront.com/files/GTR+2+Demo/;5284969;/fileinfo.html[/QUOTE]
So Race 07 is the most up-to-date game in the series, with Injection (which includes Race 07), Race On, and GTR Evo as expansions for it. So if I buy Injection, Race On, and Evo I would have no reason for GTR2, right? If I don't care about racing at night, that is. Is this the best option in your opinion, since it sounds like you have experience with them?
EDIT: So Race On AND Race Injection both include Race 07? Ugh, my head is hurting, someone just please tell me what to buy for the best possible installment (along with the best dlc) this series has to offer.
Also, would these games stack up to the likes of Forza 4, Gran Turismo 5? Do they hold up well? Is trying to figure this out even worth it? lol