Any Garmin color unit will make an excellent choice. They have all the features you need and all the data fields you'll want if you are a numbers junkie. If you are going to buy maps for the unit, get an X series model that will allow a micro-SD card to store maps with. The Etrex series with the H have a new high senativity chip in them that would be good for hiking and dense environments.
If you need a magnetic compass and/or pressure altimeter, go with the Vista HCx. If that's not important, save a few bucks and get the Legend HCx. The Legend will give you a compass bearing when you are moving and a elevation reading based on GPS but the Vista would be more accurate in those two areas.
The Colorado would probably be great but in my opinion, it's more pricey than you need in my opinion. Plus I know that the Etrex's are solid as a rock, I've drop mine and wrecked my bike and they still work.
Avoid the Magellan Triton at all cost right now. I own one and it's so many bugs, it's a joke.