mx5cartalk.com

If you can do it all yourself and sorce parts cheap then your budget will do nicely:)
Mine ran just a bit over ( but I got my ECU dirt cheep)

All i can say is now I want more boost but the Engine is already on its way out.

search is your friend

there has been so many people do it recently and their costs etc are all listed in their posts

search by authour

Boags' MX5
Uncle Arthur
Fatty
Fuzzlet

there are more but the names are not droping into my thoughts!

There is a guy in Perth with a Greddy td04 kit with greddy front mount and pipes for $1500 and that leaves you some money for Engine management and injectors.pix is his username.