gps selection

looking for input regarding gps selection and mounting. i'm looking at garmins in the $500 range, but since the ff/df that came with the boat leaves a bit to be desired (as in ability to turn on) i may be interested in a combo unit at a higher cost to conserve dash space, as long as it has the ability to go full screen with both the df/ff and the gps.

the vhf is currently mounted inside the cabin, and the ff is on the port dash, but i'd prefer to have it all in front of me.

who's got what gps wise, where is it mounted, and would you recommend it?