Any specific reason why we need to buy a server? IMHO renting a dedicated server with unlimited bandwidth could be also an option, e.g. see
http://www.micfo.com/dedicated-servers-web-hosting.html -just an example which I googled, there are plenty of other companies. But as robspot pointed out, we need a spec first - How much RAM, HD, which CPU...
I have to agree with Werner on this. I personaly looked at puting a server a server in to a Co-Lo site and it't more expensive. Basicly they rent a server for say £20 pm but to put your server in there was £30.
The bandwidth thing has two parts.
One is speed. The current server will most likely have a 100Mb LAN cand So it can transmit about 10 Megabytes per second.
The other is the amount of data. This is a poptential limit on the Volume in Gigabytes you can transmit in and out.
What we really need to have are the volumes. Unlimited bandwidth for say £50 is a waste of money if your only using say 10Gig and you could but that for say £10 per month.
You need to watch out for FUD.
t.