I did something similar buying a couple different SRT Dodge models for dailies. The trouble with that (for me) is we still have the same bug and spend money modifying/upgrading the daily hot rod instead of playing with the classic hot rod.
I've been pretty good about not modifying DD's. I think i'm going to pick up an Explorer ST shortly, and have it in my mind to not modify it at all despite folks getting 600HP or so from then with relatively minor mods/tune.