On the 360 vs PS3, it may be a matter of personal preference. A year ago, I looked at both, and decided a 360 was for me. I don't have a PS3, but I love my 360, and wouldn't trade it heads up for a PS3 right now. That being said, some of it depends on the future. Are you going to get the one you sell later? If so, there is appeal to keeping the 60GB model. If you aren't though, hard to use that as the reasoning. Only you know your gaming styles and the games you really want (and how badly you need that money).
I do find your wife having an issue since you have 5 systems. I have more than double that in my house (with 5 hooked up to the tv at any given time. I think it helped that my video game collection was well established when we got married, and it was a non-negotiable point (it didn't hurt that she goes back there from time to time to play, and I've done everything in my power to help nurture her love of games). Not saying that many guys have to change when they are married (I know I have), just sucks when you have to sell your systems because the wife has decided that you have enough.