Evo's are sick when moded. My friend have a 2003 stock and they are a little bit slower, than the new ones. He runs high 13's which is alright.
Also I read in a Car and Driver that the evo RS is actually faster than the MR, because of weight reduction
The MR also costs like $8k more and many say it's not worth it.
I think RS cost like 28k and the MR is like $36k.
When you get a Evo just be careful the stock clutch is kinda crappy and mistu will void your warrantly like there is no tomorrow.
I love Evo's, they have so much potential. I have video's of stock tubo evo's running 10's.