5-6 albums @ what bitrate???
Just remember that a windows update can eat many 100's of megabytes as can program patches plus dont even think about listening to internet radio or streaming NASA TV cos they'll eat up a 2gig cap in a few days.
If you are experiencing BB for the first time I can guarantee you will use a LOT more, you will try everything going and probably reach a 2 gig cap in a day; I was streaming audio, video, downloading film trailers, music, games pictures.
I downloaded 1/2 a gig of mission files for Ghost Recon and some exersise videos for my back last night while listening to RadioIo, reading the latest BOFH on The Register and trawling the net for cheap tyres and properties in Cyprus, I doubt it came to less than 2 gigs for the evening.