I would trade up! I assume (due to the limited years of production for the Mazdaspeed 6) that its at least an '06? Is that correct?
Here are the breakdowns between the two;
Evo M6
271hp 274hp
273ft/lbs 280ft/lbs
5.27 0-60 6.1 0-60
So your other points are probably more valid. Realiabilty I would say Mazda...and the Mazda doesn't look so boy-racer. Would you ever really feel the difference between the 0-60 times? I doubt it. If you like the 6 and want something newer then I would go for it. The retail for both car; Evo approx $17K and the 6 approx. $20.5K to 22K. So the even trade might not be bad either. Obviously I dont know the condition or milage on either. That is my .02!
All info from
New Car Prices, Used Car Pricing, Car Reviews by Edmunds Car Buying Guide
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2004 Toyota 4-Runner SEV8, Natural White
1950 Chevy Streetrod, 502hp/546lb/ft torque