I don't know whether you need to get the amp quickly or not, but I'd recommend waiting for the right one to pop up. Usually prices go this way: DRG>HRG>SRG, and Head>Combo (as many people prefer to use the IIC+ with an external cabinet). Of course the price will also depend on whether it's been well taken care of (both functionally and cosmetically) or not. I insist on waiting for the right one to appear because the prices can vary substantially, not only because of what I said above, but also depending on how many IIC+s are up for sale at the moment, and the urgency of the seller. I attach this link to an eBay add of a nearly mint IIC+ SRG that sold recently for 1500/1600: http://www.ebay.com/itm/Mesa-Boogie-Mark-IIC-/141732352435?hash=item20ffe811b3 However, I admit it's the first time I've seen a IIC+ go for that low, they usually sell for 2000/2500.
The ridiculous thing is that there's an add on eBay right now for a IIC+ SR Head and the seller is asking 3000.
Good luck!!