If you add the following features, I will convert my site over to XenForo:
-Gallery. Please don't load it up with useless "features" like IP.Gallery has, like rotating an image or adding notes to an image. It confuses my users and looks like crap.
-Wiki. This is critical. MediaWiki is useless because it gets spammed daily with fake accounts, and I can't connect accounts to IPB. Yeah yeah there is a mod that doesn't work and screwed up my installation of MediaWiki. So no, it isn't supported. I think a Wiki should be built with the same forum software, so everything is consistent.
I'll keep an eye on this software. Please don't bloat it with useless features like topic ratings, and all the garbage that IPB and VBulletin waste time on. I invested an enormous amount of time into IPB and I feel like it was never designed to be anything but a crappy looking photo sharing site. It's extremely hard to design anything that doesn't look like default IPB, and default IPB looks horrible. XenForo looks gorgeous, except for the default colors.
I don't care what the cost is. If you provide what I need, I would pay $2000. It's cheaper than hiring someone to keep fixing ****ty broken IPB.