I like the GT500s and think they will retain more money than a Mach; but you will be spending more to get it so end the end you will net the same. Realizing an investment would be so far down the road that you will not enjoy the profit.
Buy what you want to drive, period. If it is paid for, have both.
I say go drive one and then decide. You may fall in love or not. I suspect you will fall in love.
