I've looked at the eTrex second-hand on ebay, one thing though, do you know what the difference is between the 'H' and non-H versions, the H is the newer but the specs seem identical??
The Dakota 10 looks very good, if I went for a dedicated unit it seems to have everything you'd need at a decent price
But the question is why do I need one rather than the phone/BT GPS? I can see both advantages and disadvantages with no real killer reason!! If I was hiking across Dartmoor looking for caches then I could see a reason, but I doubt we'd travel more than a couple of miles from the car....