Go for a c4 or a b16a both cheap and easy to pick up.
Naturally you've to expect a few issues with a cheap turbo I wasn't saying go out and buy the cheapest things you can find, just showing that the engines can handle it!
Just to clear this up..
Say if my b16b running at 8psi is making 250bhp, but then if I turn to boost up to 10psi and it runs at 280bhp, this is still safe as it does not exceed 300bhp?