In reply to maxsmith:
Possibly controversial, but I'd got for 1.5, 2, 2.5 (or possibly 1-2) if you're mostly doing longer easy routes. These are likely to be the most used sizes, and above this, your existing hexes will probably cover it just as well, or alternative placements often exist, and below this it's likely there'll be just as easy nut placements.
I imagine you're more likely to want the same approximate size multiple times than happen to need exactly a 1, 2 and 3, and assuming you're not cranking off one arm pumped out of your mind and just wanting something to fit the random slot in front of you, having a large range of possible placement sizes shouldn't be as much of a necessity.
I would also go for fewer nicer cams as opposed to more cheaper cams. It sounds like you're not in need of them for a particular route/project/grade and therefore there's no need to splurge on a full rack of stuff you might want to replace sooner.
I'd agree on 4CU's over heliums, but would suggest that 1-2 totems would suit you better for wandering mountain routes - much more flexible and less likely to walk, and stick better in the sandy/polished limestone you can find in the Wye.
After trying to slim down my rack somewhat, I not no longer take my size 3+ (single axle) cams as standard.