Voltic and surano by far. Surano is a whole 100k cheaper and nearly faster than the Carbonizzare, not to mention classier styling, yet no one has one. Bullet as well is the best bargain super and looks and sounds better than any of them for the price.
The Surano has no good mods that make it look good, though.
The Surano doesn't need mods to make it look good.
I nearly bought one, but I got a Banshee instead because of the handling. I really like how the Banshee is similar to the muscle cars in terms of handling.