I would recommend the Garmin eTrex any time. It's been out for quite a few years now, and only offers one saved route, but for basic GPSing it is still very good. Price tends to fluctuate, but I bought mine for £100 a couple of years back (I think they're more like £120 now).
Its big plus points are: long battery life, ease of use, rugged and water-resistant construction, and clear display of information. The drawbacks are (as I mentioned) only allowing one route to be saved, and apparently some people have had problems with conversions between lat/long map datum and OS GB ... not that I've noticed any discrepancy there.
The only problem I've ever had with mine is that, after nearly three years, the rubber rand-thing around the edge is starting to peel back. This started after a very hot day on Tryfan and I think the heat was too much for the glue to cope for. It's since solidified again, but whenever the weather gets hot the glue underneath the rubber becomes tacky. Something to watch out for!