You want to have your cake and eat it .....
Your problem is that being fast and easy to single/double-hand are more or less contradictory requirements. There are good reasons why racing requires such large crews. Also, the longer the boat the higher its theoretical hull speed but the bigger and heavier its equipment. On extended cruises a 46 ft. ketch will be easier to operate near its optimum performance for 1 or 2 sailors than a 46ft sloop, because of the much smaller maximum sail size and the increased sailplan options. The 460 should be plenty fast, provided you forego the mast furling option (I would consider batcars and Dutchman sail flaking, instead) so you can keep the full battened, big roach main. On the other hand, if single-handed operation (including reefing) is your biggest concern you may well want to chose a furling main. In that case a good boom furling system should give you a better chance of achieving good speed performance than a mast furling system. A single person can easily drive nearly any size boat for extended periods of time as long as he or she has a strong autopilot or windvane. Presumably, both of you will be at hand when gybing, tacking, reefing, raising and dropping sail, anchoring or docking. Only docking can be difficult for two people with a 46 footer, particularly if wind, current and dock constellations are less than favorably aligned. Getting a Maxprop should get you much better handling in close quarters (improved performance in reverse!). If money is no object you could even consider a bow thruster.Good luck!Flying Dutchman"Rivendel II" (HL 43, hull #1)