Is the £110 for a 9300 a hard limit or just what you are prepared to pay for this project?
Do you know how much you could ebay the existing box for, and put the money towards something new? For example:
http://www.ebuyer.com/product/148249
£153 for a new Shuttle with AM2+ socket that can take up to a 955BE, gigabit, decent (compared to what you were looking at) graphics and the option of a single slot x16 card if you want proper graphics on it.
The Intel ones seemed more expensive, and only came with a 250W psu.