I've ridden Xcelerater and Rita. Xcelerator is awesome. The lauch is a rush (pun intended) and I can't get enough of that tophat. Rita, however, doesn't come close. The ride shuffled a lot for being new and I didn't care for the otsr on it. On the plus side, the lanch was better then expected and the trains are roomeir then on most Intamin rides.
I'd have to aggree with whoever said that the "Rocket" coasters haven't retch there full potencial. A coaster with a Hydralic lanuch and a tophat, as well as a layout like, say, S:RoS or Expedition G-Force would be the perfect coaster.