Yep, got the top of the range eTrex here. Invaluable when searching down sites. As to PC usage, the maps don't come cheap - I went for GPSMapMaster at http://www.gpsmapmaster.co.uk/ - takes a while to download the maps from MultiMap, one cell at a time, but does the job well. I've even set it up to monitor the GPS whilst driving and it showed my progress on the laptop screen!
I'd say you really do need the PC connection, if only to set up and download the waypoints to the GPS...