i use the mackie mcu pro with the c4 rotary controller.
all the other surfaces fall short for me because they cant handle large plugin control. the mcu works with many daws and the c4 automatically maps any vst.
with your budget, you could get the mcu, the b4 and possible 2 fader extension units bringing your fader count to 24!
those four units would look pretty sweet all lined up in a row!
the ssl loooks cool, dont know much about it, but if plugin control is as huge to u as it is to me, you need the c4.
any old control surface can provide transport and track control.