if it were between an sti and evo 10, i dont know im pretty much 50/50. i like the evo 8 and 9 ALOT more. reliability wise. i know people with both, in general it seems like the evo takes a little bit more regular maintenance. where the sti's have more big problems. just out of the people i know 2 people have had to replace the transmission in their sti, one guys tranny is going out, and one blew his motor. id say they are pretty equal in terms of reliability.
just get an 8 or 9 and you will pay half the price for a much better car.