Customizing Huawei W1 Alert Tones?

I have the Huawei W1 and I'm trying to find a way to change the alert tones. I hardly get phone calls so I would much rather change the message tones than the call tones.

Is there a way to use my own personal ringtones? I have heard of Handcent and GO SMS or whatever it's called and if I have to download one of those, which one is better?