i thought nearly all 3D map based computers had auxillary outputs for running variable valve timing?
either way, asking if a computer will "do the job" all depends on your tuner. you could probably even get a nasty old analogue microtech D5 to work too, with the right tuner. i don't mean to be smart about it, but it's true.
whether it's a good computer is really up to personal preference and general concensus. from what i've heard, a haltech can get almost anything to run - and run well.
i would rank them in order as
microtech
wolf
link/hawk
haltech
autronic
MoTeC
delco
that's pretty much the order of expense too - bar the delco which can be had for cheaper than a microtech. i dunno where a megasquirt fits in there either - i'd say around the link/hawk area there (but not cost wise).
sorry for the rant.