In reply to Oldbro3:
It'll depend what you're climbing on as to which sizes will work for you but my initial rack consisted of a set of WC Classic Rocks (1-10), DMM Offsets (7-11) and an old set of WC Hexes. I also got some old Friends from a friend. These all did me fine for some winter and simple trad up to E1. I've subsequently added a set of small DMM Wallnuts (1-6) and Black Diamond Micro's that I got a deal on, but the wallnuts were mainly to pad out the bottom end of the rack on longer 60m pitches. If you're climbing on grit I'd probably focus on larger wires (and large cams/hexes) whereas I find the larger wires and hexes are barely used on my rack, most of my placements are size 6 and below. Bigger, and I tend to find myself using cams.
I think the key is to get the stuff that gives you a good spread for what you're likely to climb, and then pad out to suit what you like using and what suits the stuff you find yourself on the most. I'd be inclined to go for BD Stoppers rather than the WC Rocks though if I was buying again as they've got an extra taper which can come in handy (and has done on the few occasions I've used them from a partner's rack).
Oh, and get a nutkey...
Post edited at 11:47