I would go with Halo 3.
1. The PS3 userbase is expected to peak at ~half of the PS1's total.
2. No racing game aside from Forza has shown improved sales from generation to generation so far and the other mainstays like NFS aren't doing too hot.
3. Some of the simu/arcade fans of GT have been seduced by Forza 2 as shown by its increased sales.
4. Halo 3 is expected to pass or has already passed the sales of 3/4 GT games, GT 1/2/4 with only GT3 remaining above it.
Tease.







