I would recommend the Garmin eTrex Legend ("little blue GPS, at Target for around $220", on sale $180 plus $50 rebate from Garmin).
I have used this unit extensively for the past 3.5 years and I have loved it. I use for backpacking, finding points of interest in unfamiliar cities, as a backup navigations source while flying my USAF missions (pilot), and on my bike to navigate and check speed. It is SMALL, waterproof, durable, and has a high resolution screen that makes discerning detail in a 2" screen possible. With it's neoprene carry case, it clips readily to my backpack straps. With it's handlebar mount is goes with me on all my bike and scooter treks.
I have purchased just about all the Map Source software for this unit including Topo, MetroGuide, and Roads and Recreation. The first two are the most useful.
The eTrex Legend has an advantage over the higher end Summit model in that it's batteries last longer. When you have a baro and electronic compass (not needed really), it burns through batteries quicker as these features are always operating. Battery usage is important when you've backpacked into the high country.
I do have a two of critiques on the Legend however: 1) I wish it could take an external antenna. This would be helpful when using it in the car or aircraft. 2) They need to improve the quality of the battery connectors. I have noticed when the unit is subjected to high vibration (like when on my GoPed GSR scooter), electrical contact with the batteries can be lost and the unit will turn off. An irritating occurence for such a high end item and one Garmin needs to fix.
But all-in-all it is the best unit out there and the price has just come down. Get it at Target and go to Garmin's website for a rebate that is currently in effect.
