In reply to kingjam:
To my mind a simple harness with four big gear loops, fixed leg loops and a single buckle on the waist belt is perfect for all types of climbing and is one of the few items of climbing gear which I don't see the argument for owning multiplies of.
My last three harnesses have all been of this design and i haven't missed having adjustable leg loops. I do all aspects of climbing from sport climbing, to expeditions. The vast majority of my climbing is multi pitch trad.
Ice screw clipper slots, whilst nice are hardly essential. Just rack your screws on a big biner, like a BD Ovalwire, and spin it round so the gate faces outwards and opens downwards.
Recently I've owned the following harnesses
Petzl Hirondelles. Pros: very lightweight, not that bulkly reasonably priced. Cons: very lightweight - wore it out in an alpine season; Not that comfy for hanging stances; gear loops quite small. I wouldn't buy one again.
Arc'teryx R300. Pros: very lightweight, exceptionally comfy, four big gear loops, packs up very small, fairly durable (mine lasted 2.5 years of regualr abuse). Cons: Expensive (but not really when you think how much you wear it), they changed the sizing when they updated the design and now don't fit me. Shame as I'd have had another one like a shot.
BD Chaos. Pros: quite light and comfy, four reasonable sized gear loops (smaller than the R300's but big enough for a full trad rack), rated haul loop. Cons: Not as compact as the Arc'teryx, quite expensive. I haven't used it enough to comment on its' durability.
I haven't owned one but another harness I would consider is DMM Maverick.
For those worried about getting a full rack on a harness, I don't have a problem getting the following onto four gear loops: 16 QDs, 16 cams (black, blue, green and yellow Aliens, Camalots .3 to 4 with doubles of .5, .75, 1 and 2), 4 krabs of wires, belay plate, extra screw gate and nutkey. Plus a few slings wrapped round my shoulders.
(I don't see the point in twisting up slings and racking them on your harness. It just takes up space on your harness and makes them harder to access when you need them.
Top tip if you do struggle, use Yosemite racking to create space on your harness:
http://www.planetfear.com/articles/Yosemite_Racking_283.html
I find this works really well if you are doubling up on cams. E.g: clip both one Gold Camalot to the other.
HTH