While you're at this cross road you might as well spend the extra and rebuild the engine to surpass oem specifications. You might be fine with an oem shortblock for years to come, or you might find it suffers the same fate in months and you find yourself back at the beginning and reaching for your wallet again. Do it once, do it right.

Research builders carefully and have a chat to them about your options. The engine shop have done some very good work for people I know and would be an option I'd consider.

__________________
MY08 WRX 325hp/456nm/18psi E85