I've been going off of this list
http://www.gtplanet.net/forum/showthread.php?t=134047 which is pretty accurate. I don't see the TT in there, but doesn't mean it isn't a reward. Maybe from the level XX tickets? Also the Lexus IS F can be won from the Nurburgring 4 hours b-spec, so once I finish the german touring car event I'll sell it off till I can win it back.
And yeah Rag, where the wheel is setup is pretty important too. I've always used a small TV dinner table like this
http://www.amazon.com/Finish-Solid-W.../dp/B00136CUIU so I'm used to it. The back on the bottom is nice since it stops the pedals from slipping. The table I have has enough weight so when I steer pretty hard it doesn't move too much.