I've got KW V3s on mine and I love them. The ride is no worse than stock. Sure it's inherently stiffer, but it's so well controlled than you don't even notice any degredation from stock. The car handles incredibly and at the limit is more predictable than stock. I might stiffen the front sway up slightly if I go to a square tire setup, but as is, I cant imagine anything performing much better without spending an astronomical amount of money.

Of course, mine still has usable suspension travel and legitimate performance tires that fit the wheels they're mounted on properly, so that may have something to do with it.