One other thing to remember - and it's brought to me every time I drive something other than myb MSP, thinking I may be interested in something other than my MSP:
I make decent decisions.
I thought out the MSP purchase well beforehand, test drove most of what was available (WRX, MiniS, GTI/GLI, restored A2 VW's, even the Vibe GT and Matrix) and made my decision. Still, sometimes I drive other things - the 9-2x, the R32, the STi - and enjoy them. My MSP (thank God) is paid off - a major plus - and trading it in loses money. Further, it out-drives all of the above in terms of enjoyment for me, which is the most important factor for me. OK, OK, I liked the R32 better, but not "MSP + $15k" better.