Actually, for the money, the best value has to be the Garmin eTrex H, with the same chipset as the higher tier units, but without the mapping SW, Elect. conmpass or barometer, but it does have a sensitive receiver, and this IS what you want!
I have the Vista HCx and the eTrex H and BOTH lock on to at least 8 birds at the very least.
I get fixes on both units in the basement without a hitch.
For low cost, ease of use, the eTrex H series is hands down, the choice.
Move uto the Vista HCx later, but you can't go wrong with the eTrex H yellow.
And Wally World has them for $99.00 in the box....CURRENT pricing(bought my second yesterday).
Happy horsing and geocaching!
AEC98
Queen Creek, AZ.