Without considering all of the hardware implications...
What are the main differences in these programs?
I've heard:
a. CEpro2 has a ton of effects the others don't (at least, not included free)
b. Pro Tools is the "standard" in the industry, but kinda tied to hardware
c. Sonar handles MIDI a LOT better

Before I lay out the $200-500, I'd like someone to "compare and contrast" strengths and weaknesses.