I'm also in your situation (planning to get ADSL). According to what I've read about this on previous posts, 512Kb seems to be enough unless you have special heavy download requirements.

I'm also not sure about Mozaic. I've scrutinized previous QL posts about Mozaic, and found that some people seem to have had positive experiences, while others are disappointed. The good thing is obviously that you get it "for free" if you are getting ADSL anyway.

Qtel website is unprofessionally designed and doesn't provide customers with details about options, features, installations, etc. And their application forms aren't any better.