To save money, and for it to be completely custom, build your own kit.
Research is the only way to do this, you will need to read read read..
I would suggest making an account on
www.turbod16.com and just reading and do tons of research.
Making your own kit can be alot cheaper than buying a full kit.
Some good turbo's are 15g Greddy, 18g Greddy, any Garrett turbo... but you will need to do more research to find out what turbo will suit your needs