Serious Decisions!!!

I have an actual Blog this time around. So this will be pretty special to me. I currently own a PS3, Wii, DS, PSP, and a high-end PC that bursts with awesomeness. I have been contemplating getting a 360. The only issue is that I'm not really buying the system for a reason, I'm gonna buy it out of impulse. I will end up having the opportunity to check out some games that I haven't had the chance to play before, but I'm trying to decide if this is a smart decision. All of the PR talk from both sides are starting to confuse me a little. Sony talks of continuing to make first-party exclusives for its console, and Microsoft is talking of making everything multiplatform. So the smart decision is obvious, but expensive. Since I already have a PS3 and a powerful PC, is a 360 a wise decision?

This'll still seem like a debate blog in comparison to my previous ones, but this is a serious decision on my part. If you guys think a 360 would really be worth it, explain your opinion and list some games you would recommend. Any input would be appreciated, and I don't want to seem like I'm stepping on toes, just looking for answers. Thank you.