In reply to ewanjp:
If you've already got a set of Wallnuts, a set of the DMM Offsets will complement them nicely and take you up to a total of 16 nuts, which is probably enough for most pitches. Otherwise, if you really feel that you'll need more nuts, Chris's advice re. buying a different set is solid.
As far as the quickdraws go, there are some very good deals on 30 and 60cm slings at the moment (Rock and Run for one) - buying packs of those and lots of karabiners may well be more useful in the long run, particularly if you already have short draws, as you can rack and use extenders just like short draws by doubling them through the krabs, but with the obvious advantage of being able to extend them when necessary.
Also, considering sacking off the hexes and spending that money on an extra cam - hexes aren't much lighter and are generally fiddlier and less useful once you progress past Severe, which won't take long if you're both competent climbers. They're also make an awful racket and are just generally kind of shit and punterish, whereas a nice blue Dragon or equivalent will always be handy and never a source of regret.
With regard to cam selection, the Dragons are generally always cheaper than the Camalots, and the old-style Dragons are reasonable when bought in bulk - three or more and you should be looking at £40 each from most decent specialist shops.