MT4 price data and memory size

I'm on the verge of getting a broadband service for a laptop (Toshiba Sat U205) and I'm wondering if anyone knows how large price data is in terms of memory when MT4 is running. The reason I am asking is because Cingular offers various monthly rates for the amount of data that is 'used'. If I use the service for 40 hours a week to only run MT4, how would I figure out how much data useage that is? Here are Cingulars rates. Anyone have any ideas? And in case anyone is wondering, I still haven't got the email configuration to pass the test...

DataConnect

$19.99 5MB

$29.99 10MB

$39.99 20MB

$49.99 50MB

$59.99
Unlimited Included

$79.99 Unlimited Included something else