Well, if price was no object you'd probably be looking at Lexicon. But reasonably, for your choices I'd put them in order of Pronto, Take Control, RC2000.

This site has a list of over 25 mail-order sites that carry the Pronto, and about 8 for the Take Control. The only reason the second list is shorter is it's only been up a short time. You'll probably find a lot of the stores on the Pronto list also can get the Take Control.

You'll find other user experiences on ordering or pricing for the Pronto & Take Control in their respective forums.