I don't think there is anything that integrates as deeply with Sonar as the VS700. So if you want to get close to the mixing console feeling with quick access to EQ and plugs, you should keep an eye on ebay until eventually a VS700 turns up. I still use mine heavily and currently would not trade it for anything that is out there (in the same price gap)
Apart from that you could probably stack 2 Behringer x-touch, but that would only give you limited Mackie Control options ... which you could possibly extend creatively if you are in for your own custom solution using Alexey's controller utility (check
www.azslow.com)
Getting anything else Faderport 8, original Mackie units, etc. will put you in the same boat as going with the Behringers ...
so to cut a long story short - controller dont sell well, that's why there are not many options out there ...