I've had my CT for about 3 years now (maybe more) and I just have the 4 control footswitch that it comes with. I have a Bassman sound for most of my work, another with some chorus, one with a bit more gain and distortion and one with a tremolo. Basically, that covers all my bases.
SUre there are more settings you can have, but I'll spin the dials when I'm at home, but when I'm playing out with friends, all I need are the 4 settings. I don't see the need for too much more.
I do run a Crybaby through it for some fun, but the only thing I've ever thought about adding is a switchable overdrive pedal and a volume pedal.
All told, I'd be out about 250 bucks for the other pedals-n-such, vs. spending that much for the foot controller. But you get to pick some of the effects, and if you ever dump the amp, you can still use the effects. The foot controller is not universal.
Contrary to what many say about this amp, it can give me most anything I need. Sure-it's no Badcat or Shiva, but it does sound pretty nice for about a grand.