Hey man, you should check out K-1's official website, they have all of the World GP's (K-1's largest competetion w/ the best fighters), they have every fight from 1993-1999 on their website, and its free and high quality. They also have tons of KO videos.
The only thing that their site needs is to upload recent K-1 fights, but other than that its a great site.
Ray sefo vs Mark hunt
Buakaw vs Masato
Le Banner vs Abidi
All Hunt vs le Banners save maybe the first
Also, fighters to look at are
Semmy Schilt winner of the 05,06,07,and 09 GP
Jerome LE Banner
Buakaw Por. Pramuk(sp?)
those three are guys to check out for srs.