Aztec is also really only a four seater but has a problem in that if a particular engine fails you have lost not just the engine but also other systems
Our 1966 Aztec C had a usefull load of almost 2200lbs with a max T/O weight of 5200lbs.
I don't call that a 4 person airplane by a lot shot, that's 6 plus luggage plus full fuel.
Aztec slower then a Twin Comanche? I flight planned ours at 160 kts TAS and that was at 21" MP and 2300 RPM.
Aztec's are available in many different flavors, we had dual vacuum pumps but the hydraulic pump ( flaps & gear) was on the left engine.
There is an STC for dual pumps.
Here's a nice one:
The link is here:
http://www.aso.com/i.aso3/aircraft_v...xxxregionid=-1
My vote goes to the Aztec.....