If you're determined to stick with the PC option...... I know that both Aldi and Lidl buy in batches of high spec and very low price PC base units. You may want to give their websites a look to see if anything comes up.
I've no personal experienceof the kit, but read a couple of positive magazine reviews last year.
I can vouch for Evesham support, though the grapevine suggests that it may have been going downhill a little in recent years.