Don,

I have been using the E-Flite Six Series motors in planes like this, including the Gulfstream design that was just published in the September Flying Models.

My preferred setup is EFLM2000 2000Kv inrunner, APC 6x4E prop (also 6x5.5E and 7x5E), EFLA1040 40A ESC, 3S 2500 25C or 30C Thunder Power pack.

If you want more speed, get the 60A ESC and EFLM2005 motor (2700Kv) but be careful for cell life.

Andy