I don't know about others but i feel the GEN2 has got some potential for aesthetic upgrades. I've seen some really nice modified Gen 2 in town. A nice bodykit and rims would be pretty much enough to spice up a stock standard Gen2.
The Waja on the other hand looks a bit boxy. Its still a nice and sweet handling car, but you ought to be careful when dressing it up with bodykits. It'll look ugly if you fit the wrong bodykit.