Can't go wrong with the megasquirt @ DIYautotune.com. Mine should be here Friday!
MegaSquirt I Programmable EFI System PCB3.57 - Complete Assembled Unit DIYAutoTune.com
I paid $454 (cdn) shipped including all associated cables etc. I went the lazy route though and ordered the assembled one, you can save about $100 by assembling it yourself.
I will be running a GT25R 50 trim turbo with a T3 back half and small fmic. All to be installed next weekend!