The ProCom 4 is over $500 and will only control 1 pit.
The unit isn't listed on the BBQ Guru's web page, it says to call for ordering information. The units are still for sale on third party sites though.
I'm geeky, I have a CyberQ WiFi. It works great, but will only control 1 pit. If I was looking for a multi pit unit, I'd get a Stoker.
The IQue 110 is a good unit. Buying 2 IQues to control 2 pits is not a bonehead move. It's a good plan and I'm sure others are also doing it.
BTW, nice cooks!