The HPI RS4 Pro3 might make a good un-prepped parking lot car since it does have a lot of chassis flex. I own one and have been meaning to set it up as a VTA car (25.5 motor).
If you run a 2s lipo in the Pro3, you will either need a shorty hard-case lipo or a soft case. Not very many 2s lipos will fit in the Pro3 because they are too long. Regular round-cell NICAD/NIHM batteries in a side by side configuration (OOOOOO) will fit fine. Stick pack NICAD/NIHM batteries also are too long to fit.
The Pro3 also lacks droop screws, so you would have to adjust droop with internal shock limiters or by adjusting the lower shock ends.
If you are looking for an aftermarket graphite deck, Penguin RC makes/made one for the Pro3. (http://www.penguinrc.com/products/hpi/p3010.html