Re: bandwidth control.
Try Bitmeter. There are options for ISP limitations that will alert you when you come close to a set amount of bandwidth. I'm not sure if it will cut you off but it will alert you.
Abit IP35-E Motherboard, 3Gig- corsair RAM
PNY 9800GTX+ 256MB DDR3 Video Card,
Core 2 Duo E4300 overclocked 2.2Ghz
SATA Western Digital 160Gig HD,
Windows 7, Dual 19" 1440x900 Monitors