For the amount of money it costs, you're better off just paying the money and getting your own server space. Hell, I've been signed up with these guys for about 5 years and have never had a second of the service being out. It's like having an extra
2 gig hard drive on my desktop that I can use for storing files and making my own web pages. Plus.. five of your own domain names and 1000 custom email addresses... can't beat that for making yourself look serious about your music instead of using Google or whatever.

Seriously..it's so little money I don't even remember I'm paying for it (like maybe 4 bucks a month) and almost every link in my sig is stored on there so I depend on em to work every time. If I click on 'Peace & Grooviness' below I know it's working.

Otherwise, paying for Soundclick is the next step. They have a nice user interface and the MP3's look very profession. Plus if somebody likes your music they can buy it, so you easily make your money back.