do you need keys? pads? or just sliders and knobs? or sliders only?
maybe Mackie MCU Pro would be what you are looking for?
or check out zoom r24. it's half the money you want to spend. you get a controller with 8 tracks - faders, transport, plus 5 buttons you can assign as you please. supports Logic out of the box and additionally you get a drum machine, an audio interface, a sampler and multichannel recorder within one unit. and for the rest of the money you could buy yourself another piece of hardware.