Hi RobbyA,
You'd lose the Harmony if you move to CreateXT, which would be the biggest loss in IMHO, but if you don't use them either, then you can probably sell your Touch for enough cash to cover a CreateXT.
If it's a form factor issue, you might want to look at Play or Play GTX if you still want finite control over presets etc. but are moving to a small'ish floor unit. You'd retain Harmony and looping, plus have more control than the CreateXT. That said, some people are looking more towards having a couple of presets they like and sticking with them, which would work well with Create.
My suggestion would be to go into a store and play around with the units for a while and see which feel you like better.
-Craig