Anderson vs. Imanari
Dos Caros Jr. Vs. Brock Lesner
Hong man choi vs. Brock (both in prime) 
ortiz vs. randleman
rickson vs. saku
kerr vs. anyone good (other than inoue)
Randy Vs Wandy - I was at UFC 49 and it was Couture vs Belfort. Wandy was there w/his PRIDE belt ( a small japanese man was carrying it around for him). I wanted to see that fight ever since!
Cro Cop Vs Arlovski in their primes.
Igor Vs Vitor