The Apogee duet is over budget but has good reviews. £299 currently, but with the Duet 2 just about to come out it will see a price drop. Mac only though I think.
Otherwise M-Audio have a good reputation at the low price range. Alternatively Focusrite do some good interfaces. I've no experience of either though other than my old Delta 66 and a Audiophile PCI card which both were adequate.
Cool, yeah, the Apogee is a bit too much I think, but I might get one if the price drops as I've wanted one for aaaages.