The EOS 3 is roughly the equivalent of the F100, but if you're willing to spend a bit more I'd say go for the 1N/1V to be honest, they are a half body camera as standard powered by a 2CR5 battery (housed in the removable grip), or you can buy the motordrive which lets you use 8 AAs and gives you the vertical grip too. This is (imo) more secure than the grip on the F100 as it replaces the standard handgrip too, instead of just screwing into the bottom.

A good illustration is here:

http://www.mir.com.my/rb/photography...nfo/indexA.htm