Since you wanted some pros:
If you leased a SRT-4 then you would avoid the hassle of dealing with repair issues later on (which, despite what SRT-4 owners claim, are probably going to be fairly annoying on a car that close to the limits). You would also save some money by not being able to add mods, and you would be able to "disown" the car in a few years when it becomes not so fun/interesting to drive anymore.

This is of course, assuming that
1) You won't go over mileage
2) That you're happy with the SRT-4 as is (have you driven it?)