My favourite has to be the AS365N2 Dauphin. Has all the kit including auto ILS, Nav Couple and route display on radar. Spent many a happy hour in the N Sea single pilot IFR with no problems.
SASless. Providing you have been trained properly and have the ability single pilot IFR is less dangerous than 2 pilot IFR. All the recent loss of control/situational awareness incidents/accidents in the N Sea have been 2 crew aircraft.
Sadly company policy and JAROPS has meant the end of single pilot IFR in the N Sea
HF