it depends what you want. the thunderbird turbos will be all done by 5000 RPM, BUT they will spool fast.
I'm kind of getting the feeling you have champagne tastes and a chocolate milk budget though...
A good custom cam is going to be required to get whatever random mix of swap meet parts you pick up to work together. Any used turbo is not going to be optimal for your setup, just do the best you can though and since your power levels are fairly modest you should be able to make it. Don't cheap out on injectors, a starved turbo engine is a BAD thing.