Building My Own Servers, Hardware Recommendations? (UK)

to build two 1u rackmount servers, and colocate them to a UK datacentre. Nothing uber spec, just need uber redundancy. One box will be Linux (CentOS or Arch), and the other will be Windows 2003.

They will be webservers, with DNS, MySQL, SMTP and POP3/IMAP services.

Having trawled through google, and loads of junk and seriously out of date websites, I am still no further in my research to find a decent hardware manufacturer, and a UK source to buy the hardware from.

I have seen a few good pages, but there is never any prices on these sites.

BTW. I want to avoid DELL completely, I have had so many problems with Dell before, and if something goes wrong they won't sell you the part to fix it, and charge insane amounts to fix it. Also their configurators are a con, they give you a basic setup to start with for quite cheap - and if you upgrade it you pay the more than the retail amount for the upgraded part and you don't get the part you are replacing it with that you have already paid for in the base price.

Either way, looking to buy the components separately, so the can be upgraded/replaced easily.

For both servers I am looking for:
- redundant hotswappable PSUs, preferably front access, but with power into the back (2)
- redundant nic
- hardware RAID controller (mirror or raid5)
- hotswappable drives (2+)
- dualcore cpu
- hardware for serial terminal access (remote access incase system does not boot, or has a problem booting into the OS)