Xion in my opinion at least is better than winamp takes up like 4,000 KB in memory if you're concerned about that kind of thing winamp usually runs around from 40,000 KB-80,000 KB in memory not to mention it refuses to play songs at full quality unless you are willing to pay up.
Xion also uses psd files as skins making much easier to skin to look like pretty much anything and at any size of skin without using up more memory (memory was once an issue for me back on my old computer).
I'm hoping anyone who reads this post will check out an overlooked music player and hopefully not be put off by the default skin there are some great and beautiful skins on the home site
I hope you give this music player a chance =D