hi BB i bought one of these a few months ago.
http://www.strongmandirect.co.uk/air-compressors/belt-drive/90-litre-3hp-belt-drive-compressor.html" onclick="window.open(this.href);return false;
it looks unbranded but when it arrived it is a german Burisch comp, that if you buy them "named" are more money. like johny says go for 90/100 ltr, but sealey and other "big" names seem to be priced a little high (paying for brand) as if you look at a lot of the comps and compare motors and pump heads they are very much the same,
go for 3hp highest you can run on single phase and make sure you get a decent FAD free air delivery as some adds state 8/9/10cfm but that is its's displacement not what it will actually deliver out