[terifi]

beats me as far as best to worst, try some searching around and perhaps you can find the specifics you want to compare as far as sizes/psi/etc

some companies make kits like Greddy, Fmax, they usually run around 3-4 grand and if you dont know that much as far as turbos go, this would be a good Noob idea, but if you want the bang for your buck and/or your willing to get your hands dirty (or pay someone else to)...i would go with seperate parts, more customization, better tuning, and better performance

just my 2 cents