Stevy,
Every 1 MBps will give you 320GB bandwidth each month - you're looking at 5MBps to cover 1500GB/month.
I can give you 5MBps bandwidth for $850/month (there are NO cross-connect charges) and the rackspace (1/3 cabinet) for as low as $350/month. These prices include 24/7 Eyes and Hands service and AC power, as well as putting you in one of the best designed data centers in the world.
Drop me a line if you're interested!
Christopher Baer
cbaer@bostondatacenters.com
617-812-2000