Hi, I'm looking for a turbo for a zetec engine but i dont want to buy one that is wrong for what i need, what makes a turbo good/bad for certain applications??

Im looking for 250bhp and the option to go upto 280ish in the future, but not sure what common turbo will be the best!? (Common for cheapness)

Any suggestions on easy turbos to pick up? Ive been looking for a subaru td04l but good ones are pricey and they dont seem too common.

Thanks!