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Any motor your gonna get from Japan has probably been beaten pretty hard. Also, Japanese motors are not as low mileage as you would expect. I have had 4 Silvia's now and all of them were at/around 100,000km min. when I got them.
As far as reliabilty, either one can be very reliable.
RB25 definately has a better transmission, but is less common and more expensive in the states (from what I have heard, but I live in Japan).
RB's sound cool, IMO.
SR's are more fun, IMO. They have a quick spool and good powerband.
Either motor can handle abuse fairly well, as long as you maintain it.
.9-1bar is ok for daily boost on both motors.
It all comes down to personal preference IMO.
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