When the HT-RC1x0 AVRs were first listed, I looked at the receiver lineup on Onkyo's site to see what people were talking about. I perused the HTIB lineup and speculated that they were going to stop using the TX-SR AVRs (like they had been) and start using these. They have, with one of them at least. If you go to Onkyo's site, you will see that while the HT-S7100 HTIB came with a 606, the 7200 HTIB comes with the HT-RC160, the stripped down version of the 607.
It becomes weird, though, when you start looking at the current lower HTIB setups (HT-S3200, 5200, 6200), they are using AVRs that are not listed separately on the receiver page (HT-R370, 570, 670). Why they decided to start selling the 160 and 180 separately is beyond me, but fortunate for consumers. Also, who knows where they are going to stick the HT-RC180... the HT-S9200THX? If they do that their whole numbering scheme goes out the window. Guess they'll have to make a HT-S8200THX.
Also, the $50 lower MSRP on the 160 and 180 just didn't seem to be worth what was missing. To me it seemed like a bad joke. But given the current retail figures for the 180, I think it has become an attractive unit with some real potential. It all depends on what features are important to you.
One last thing... something is wrong with Onkyo's 707 compare page... no combination of AVRs yields the full feature list for the 707. I can get a full list when comparing the 807 to the 180. When I add the 707 to compare all three, or just two with the 707 as one of them, the resulting feature list is limited to 16 features. So, you're either going to have to print out the 707 feature list from its product page and tape it to a printout of the 807/180 compare page, or do some copying/pasting from there to get everything onto one spreadsheet.