Unichip is perhaps the easist to install. People have sworn by them and at them. The come with a preconfigured tune. It can be adjusted but only by a Unichip Tuner (they cost about $800). Greddy EMB/EMU is certainly more expensive after the buying the unit (about $700 new) then a wiring harness (about $300). Then either you need to tune it or have someone else do it. THere's other options out there like AEM, Comcon and etc.
05 Matrix XR 4WD and 03 Vibe GT
"If you want Government to solve your problems, then you are the problem!" BMSR
Trix MODS: SRI w/ AEM filter, Vibrant/Magnaflow Cat-back, Alutec Lightweight Crank Pulley
GT MODS: Cosmo SRI, DRL, Auto Stop