Personally I like 1500ft on the RPS unless there are terrain, aerodrome or Controlled Airspace reasons to fly at another height.
Because I rather like looking at Merrie Old England rather than playing airliners! Did enough high flying in my old day job, thanks very much.
Best range of altitudes was in the old V-bumbler. Climb to 41000 ft or therabouts, then let down to 300ft at low level (and probably rather less over the oggin.....we had a good radio altimeter)