You should put at least 1700-1800 Watt in to the motor. The 5320/34 might be used, but also might be slightly too small for your claims. Then 5330/24 might suit perfect, on 10S LiPo. Just like tIANci said. I think 8S will give too much amperes, and low amperes is always good.

But if you choose an AXI my advice is NOT to use a Castle ESC! The Jeti regulators always work on AXI, but Castle don`t always do a good job on AXI... In fact a 77A ESC is enough, but the Jeti 90 Adv have really nice mounting lugs.

I do as tIANci mentioned: use two 4S LiPoes in serie for some setups, and the same 4S batteries work well in my smaller Yak and 3,2 meter motorglider And 2 of 5S5000 in serie for F3A, but single 5S for 50-size scaleships. Then you get a lot of flighttime out of the batteries instead of letting them die of aging.

I also second not to use a UBEC. This is because people have experienced the electrolyte condensators have popped on the UBECs when working on these high voltages! Separate RX-battery is safer.