Hi Barry and Welcome to Wattflyers, here is a Nice, Good Quality Power system with a ESC that wont break the bank.
GH GH3520-6 Motor Stats
Wire Winds / Turns: 12
Li-Po Battery : 4 / 7 cells
RPM per volt : 650
Max efficiency : 87%
Max efficiency current :
18 - 40 A
No Load Current / 10V : 1.6A
Max Current : 50A / 60 sec
Dimension : 42x47
Shaft : 5mm
Max Watts: 600W (4S) - 700W (5S)
Continuous Watts : 800W
Weight : 298g
Recommended Model Weight : 8lbs
Recommended Propeller without gearbox: 13 x 8 or 14 x 7 APC Thin Electric
here is a 5000mah 6 cell lipo 20C, this is a 100AMP lipo, 5 amps X 20C = 100 amps, this lipo should give you some good flight time and about 800 watts.
Here is a nice 5 cell 5000mah lipo that should give you about 700 Watts. its also a 100 Amp Lipo.
use a UBEC of at least 5 amps,
I would use the 13.8 prop with the 6 cell lipo and the 14.7 prop with the 5 cell lipo, check your amp and watts with a wattmeter.