I'd rather stick to zetec as I already have it and have heard nothing but good things about it. Also omex make a specific loom for it making it alot easier to put into the car and I can run there throttle body kit with it giving me about 150bhp.
I had a sportka and as lovely as it was to drive. With those mods it can't see any more than 110/115bhp? and also I had nothing but misfire problems and constantly burning out leads and sensors along with a coilpack.