bandwidth for own server

[spudley]

Hey guys, I was just hoping there is a 'web server' expert on board here - I am trying to setup a small web server from my office for... it'll only run about 20gb of bandwidth per month... my local DSL company says their 800kb/s upload speed will handle it fine (and yes, they supply a dedicated IP). Is that true? And, I realize there are peak usage times, but given 800kb/s and 'average peaks', what kind of bandwidth could I get out of this?

Second, I have 5 domains for 5 different sites - I know I can send them all to my 1 IP and let the server 'separate' them - but what are the benefits for having an IP for each domain?

Thanks!