The Spektrum line suits my needs.. I find them easy to program and fit comfortably in my hands.
DX6 for trks and some constr equip
DX7 I should get for the wheel loader as it has 3 mixes for the hyds (DX6 only has 2)
DX8 works well for the excavator, but the 3pos switches don't communicate well with the Sabertooth for the tracks.
DX10T I think will be the ultimate for a constr equip radio.. if it's ever released to the consumer, so many delays