The colo at tera-byte has been great! Very nice people to work with, and the service has been fantastic.
Data transfer- Yes, you are charged for the transfer (even if you are dedicated, especially if you are dedicated), but maybe not in the way you think. If you were to get the 256Kbps line, then you get to use everything that line can give you. It isn't burstable, so your traffic peaks and totals are limited by the line itself, and the line is what you pay for. You won't be paying for "X" GBs/mo. The listed amounts there are for reference (aprox. what that line could push per month of steady traffic). If you are close to reaching that amount or have heavy peaks then you need a bigger line (or the burstable shared plan).