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I've been DDing an RB20 swapped hatch for a couple of years. With that being said, I've had minimal problems with it. I swapped it myself using an R32 x-member instead of a mount kit and also did the wiring myself. The only problems I've had with the engine have been the coilpacks. I replaced them with some SuperSpark coilpacks and have been running great ever since.
Do all the maintenance on the engine BEFORE you drop it in...I'm talking timing belt, idler and tensioner pulleys, oil pump, water pump, etc. It is also a good time to replace the rubber water lines under the intake manifold as they are quite the bitch to get to once the engine is in.
The stock exhaust manifold is T3 flanged, not T2. RB20s boost to 10-11psi stock, RB25s are 7psi. I run my stock at 13psi and haven't had any problems...that's not to say that I won't in the future. Stock turbos are shit but cheap to replace. My RB20 makes good enough power to break loose 245s on a heavy ass 17x9.5 in second gear without the clutch....and I live at 6500ft. If are down near sea-level you could expect quite a bit more pep than I'm getting.
My opinion is that if you are OK with having less than 300hp, get an RB20. If you think you may want 300 or more, get an RB25. 25s are close to 300hp in stock form and are easier to upgrade for big power.
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