| Well BB is continuous (always on) unlike a dial up...
You need to try and guage how much you will be downloading, that includes anything from a webpage, email, streaming video, music etc etc then either go down the usually cheaper "capped" download limit or go uncapped and pay a bit more. From the sounds of it you'll need uncapped if your son has the urge to download quite a bit of music etc.
Most ISP's now are pretty good, avoid AOL though as they screw your machine up (word of warning). Also depends on where you live and if you have access to ADSL (Telephone broadband) or Cable (NTL/Blueyonder) have a look on adslguide.org for info.
HTH | 
Hybrid Mode
