yeah that is the same turbo kit i started with. that is an ok price for a brand new kit, ive seen cheaper i think, closer to just 3, 000. but hey i payed 3700 for mine 2 years ago.
ludeboom is right though, building before you swap is totally the right way to do. it would have saved me lots if i had just done it in the first place, but you live and learn i guess. do what you can afford but by any means, dont go cheap. as the saying goes; "speed costs, how fast you wanna go?"