Handheld GPS need help!

Hey all,

I am looking into getting a handheld gps and need some help.

I've looked into many units, but mainly concerned on map packs and lake contours for the gps. Mainly i would be here in the bay area and other than that, delta, and sierras.

Does anyone have a handheld? would be great if i could get some help on this one...

mike