I don't want to advertise myself, but if you are interested in fast, sweeping tracks, then check out my workthread.
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www.grandprixgames.org]
Apart from the old chicane-free Hockenheimring, most of the tracks here features exactly long straights and high-speed corners.
Also, check out klausfeldmann's links, they are even better, because most of those tracks are not betas such as mines.
Last, but not least, wait for Ripping Corpse's excellent-looking old Österreichring. You can download a beta of it by Turbo Lover on GP4DB, I think, but it will be another experience entirely driving with the proper and beautiful scenery of the Alps.