You want to get
Dxtory.
I've used FRAPS for years, but Dxtory just is much better.
Smoother recording, WAY more settings and most importantly: the ability to change the codec.
FRAPS' files are huge, an hour of footage is probably around 60-70gigs.
Using Dxtory with x264 codec and the right settings, you can probably get
the size down to about one or two gigs per hour with pretty good quality.