SC10, Blitz, Slash, Strike......in that order.
The Slash is a tank, and feels like one. Obviously the best machine Traxxas has ever produced. Much more durable, and a good selection of spare parts cost as much as a trip to TacoBell.
The Blitz is very smooth and if your running stock RTR rules with no mods allowed, it also has more toe in at the rear for more stability. Best truck for absolute box stock rules.
If you can change springs, casterblocks, rear toe, or add a swaybar, then the Sc10 is unbeatable. With a little attention to detail it can have by far the smoothest suspension as well. Best shocks if you change orings and refill often. Should be able to turn inside anything. Mine has a bit too much turnin with 30 degree caster blocks. My top pick for running mod motors as well.
Kyosho has a new SCt now. Haven't seen it in person, but it looks awesome.