Trying to Source a Pre-Built PC

Work have asked be to source a pre-built PC to be used mainly for Graphic Design, Maybe a little bit of small video editing, managing and editing the companys website and syncing a trolley of 30 iPads simultaneously (as well as the usual web browsing, word processing etc). Got a budget of around £1000, but has to include a 23" monitor within that price too.

I was thinking along the lines of Core i5, 8gb ram, a small SSD plus a 500gb HDD. Dont really want an "All in one" PC.

Any suggestions would be appreciated.

EDIT:

After looking at a post from Cat in another thread, decided to go for the Dell Vostro Desktop 270 MT with the Dell UntraSharp U2412M monitor, with 3yr on-site next day warrenty, all for £754!