well as far as reliability goes all engines break down, the Beams engine was never offered in the US so all your parts would have to be ordered from japan. If i were in your position I would find somebody scrapping a 91-95 USDM turbo engine and perform a basic rebuild. It might actually cost you less and the turbo engine has more power potential than the beams.
when it comes to reliability its all about how you take care of the car
oh, and as far as i know, the red top is the easiest swap (most common) but you can put any of them in the MR2