The only reason why evo RS is compariable to MR is because RS has nothing in it. No trunk mats, floor mats, stero, speakers, engine bay noise mat, power windows alarm and etc... Its a stripped down race preped car. It is not for every day driving. I'm not even sure if it has A/C.
I'd stay away from the STI
"We've seen previous speeds up to 104.6 mph for an STi quarter mile, but have been told that fresh Subaru engines don't loosen up until they've seen at least 3000 miles on the odo (ours had about 1200). We've also been told that engineers at Subaru have reflashed the ECU for 2005 to avoid cylinder detonation (pinging), which we've experienced in our long-term 2004 STi" -
http://motortrend.com/roadtests/sedan/112_0410_evowrx/index4.html
ouch.