As someone who has had and sold numerous IIC+, there's a lot of misinformation in this thread....
First, that particular one was purchased and returned. It was initially sold from NC about 1.5/2 weeks, and now it was returned. Draw your own conclusions. Btw, same day that it was sold, a new poster popped up on the Boogie Board describing the same exact amp, noted it was sold as a IIC+ conversion, wasn't a IIC+, then noted it had issues and returned it. The only difference - he claimed he paid about $1400.00 (which I guess could be true if you factor shipping and tax). Regardless, I don't think you missed out too badly.
Second, heads aren't more expensive or more sought after than combos. In fact, I think its the opposite. You can always order a head-shell from GTS or Mesa for pretty low cost and sell the speaker from your combo, etc. Further, this particular amp had the woodshell, which is a premium that drives the price up (not down). To not buy a IIC+ because its a combo is ridiculous.
Third, if you let the lack of the EQ dissuade you from purchasing a IIC+, you are crazy. The Non-EQs sound better. Specifically, the Non-EQs sound better with an EQ in the FX loop than the models with the onboard, particularly if you use at least the Mesa pedal (not even close with better rack gear). Before someone starts with the small difference in placement in the chain (which makes a nominal difference as it is, and not necessarily in terms of tone shaping), you can always run the EQ (if buffered correctly) between the pre/out and power/in. That said, you need to run some sort of EQ on these amps, no doubt about that.
As to price, I'd like to be in the same market as Markedman, but I haven't seen anything under a $1000 other than that ragged barebones IIC (not IIC+) on Ebay awhile back. From what I've seen, barbone non-converted IICs generally go for about $1000-1250. Think I'm wrong, great - send me a link, got cash in hand.
Finally, the whole Simul v. 100/60 v. 60 - none is better than the other in an absolute sense, it largely depends on what you want/need. More of a modern metal rhythm player - tough to beat the blurriness of the Simul, which give you the impression of a thicker more modern sound. Want a more percussive/abrasive rhythm tone - the 100/60 is the one for you. More of a lead guitarist - the 60W has the best single note tone and has a clean channel better than the rest. Btw, if you really want the Simul vibe, all you have to do is reduce the presence and/or plug in a slight speaker mismatch - it gets you quite close.