Control surface
The difference between the BCR2000 and BCF2000 is the R and the F where R stands for Rotary knobs, while F stands for faders... I would personally recommend the the BCR2000, since it has more knobs that you can access instantly. it is an excellent controller to use with softsynths, drum machines, etc.. and pretty much anything that can be controlled by MIDI, even certain preamps for guitar (where you use it to control the preamp parameter/settings). The best thing about the B-series controllers is that you are able to connect them in series, and use them in a modular fashion. You are able to control even more parameters of different MIDI capable gear with that, all using only 1 USB port.... as long as you don't exceed the total length of 15 feet of MIDI cable. You will start to have signal drop outs and latency issues which can end up being a pain in the tush beyond that length.
When you have 2 BCR2000s connected serially sharing one USB port, you have more than enough knobs to be assigned to the number of things you could possibly control at once. You just need to make sure that your setup is somewhat permanent, and the knobs on the BCR2000 are clearly marked for your reference. There's ample space under the knobs for sticking the tape and labeling them.
Price wise, the BCR2000 is a steal, it's way under $200 USD... it's excellent for beginners, and even some of the pros do not want to let it go once they get used to it and fall in love.
If anyone in this thread requires more information or reviews on other controllers, please don't be shy, I'd be glad to write a short review for you.