Need dedicated server

I want to buy a dedicated server for my web sites. What shoud i know , what shoud i ask before to make this.

Any suggestions are welcome.
http://www.uk-loans-finance.com/home-loans-uk/index.php

Pages like this:
http://www.mortgage-remortgage-loans.co.uk
http://www.mortgage-remortgage-loans.co.uk/mortgage/Flexible-Mortgage.html
http://www.life-insurance-company-uk.co.uk/life-insurance-rate/Life-Insurance-Rate.html
or
http://www.auto-car-insurance-quote.co.uk/

are with rewrite rules.
So the server shoud allow me that.

http://www.car-loans-finance.co.uk