Good thread - something I've thought about quite a bit. However, it does need to be qualified as to the intended purpose. For me it's firewood gathering on my own property, and wood is my only heat source other than a couple of space heaters. Generally I find an 18" bar does the vast majority of anything I would need. I would probably pick my 42cc Craftsman, which is a Wild Thing with A/V (pretty much a PP260). It's got plenty of power, it's dead solid reliable, and there are a billion parts saws out there as well as bars and chains. It's not the lightest, it's kind of wide, it's not fancy, but it always gets the job done. And it's pretty fuel efficient.
I'd say it's not my favorite saw, as the others are more fun, lighter, faster, etc. - but then again it's hard not to like a tool that works so well. Having used the non-A/V version as my only saw for many years, I know it would do everything I require. Further, if the economy and global trade go as I expect them to, having one of the most common saws ever made will allow me to keep it running for a long time - another big advantage to me and a additional reason I will never get rid of it.