I don't have an XBox ('gamertag' is an Xbox-specific term, right?), but my PSN name is "ElderStatesman". I've never been ridiculed for it, so it must be reasonably cool or something. I guess it bothers me a little bit that people always leave off the "Statesman" part, and just call me "Elder", but oh well, ain't no thing. Four syllables can be pretty tough, I know.
I go by nohorsetown pretty much everywhere else (sometimes with actual capital letters and spaces!), and the only people who comment on it seem to be people who keep horses, or live in small towns with lots of horses. "Well, *I've* got lots of horses in my town, so what's your problem?!" ..Geez, it's not like I'm advocating horse extermination or something. I dunno; I think my internet-namey-things are pretty good. I wouldn't say I especially care about them, tho.