I'm a big fan of dedicated multitracks over computrs (main reason being computs and I just don't get along - it always ends up glitchy and finnicky). I'll edit on a computer if I need to edit but I prefer the caveman approach of just getting the sound right while tracking as much a possible anyway.
couple things to take into account:
inputs: a lot of the lower budget ones only have 2 channels of input. this gets limiting. The cool ones have 8.
memory: big hard drive is always nice, but media cards I actually prefer over little hard drives
accessability: most will be menu driven to a point at least on some stuff but knobs over menus for stuff like EQ, aux sends, gain, etc is always nice - like a real mixing board.
fiddley bits: does it have an effect processor built in? is it any good? is it flexible like allowing you to insert effects toa dry track or is it dumb and makes you track them in line?
Tascam 2488 - really is the most feature laden one I can think of that incorporates all of the above. It's also priced accordingly though. I have seen them, used one for a couple of sessions, but dont own one myself for that reason.
Zoom R16 and R24 are both really cool as they are also 8 inputs, but kind of difficult on the interface side as its very menu-heavy. What's cool about them is that they were designed to be control surfaces as well as stand-lone recorders, the effets processor is very flexible, and they had computer editing in mind when they made them so they usually come with software too, and they are cheap.
Boss BR1600 is the other 8 input one I can think of. I haven't used one but I have used other BRs and the built-in effects on Boss stuff usually impresses me.
just my $0.02