Shawn - you need the following:

ESC - High Voltage type, capable of handling up to 10S-12S, rated for about 90A or more. You can go with a CC 85HV if you like for example or try something at United Hobbies, its an OEM ESC but cheaper.

Motor - if you want AXI then the 5330 would be more versatile, you can use it later on a slightly larger plane, if not then the 5320. The Hacker A60 is a big motor too.

Batt - you might want to look at either 8, 9 or 10 cell set up. I like 10S so I can split it into 5+5 for good performance on a 40 sized plane too. Battery should be good for 90-100As. So maybe something like a 4,500 mAh 25C battery would be good.

BEC - my personal opinion is that its no use to get a BEC, a RX pack is fine, how heavy does that get?

Wattmeter - yes that is a must ... some swear by MotorCal but I will not, I rather get actual info from the net, many forumers have given their set up on the net and you can PM them for info. I find that literally everyone is VERY helpful and not stingy with info. RC Groups is very hot on EP, you are there so ask around. Ed Lyerly is a very good guy to contact. Most helpul.

Stand off mounts - I make my own, actually get them made, I use aluminium rods like the gasser stand off mounts. Get the correct ID and OD and make them in different lengths.

External arming switch - safe way to go as you do not want to plug in the batts and then have the propellor somehow decide to spool up, chances are it will not happen but then, no harm in getting a switch sorted out. It can be bought from MaxxProd of you make your own, just a simple 4 mm connector on the system between batt and ESC.

Series Y - so you can run 2 packs of 4S or 5S for a 8S or 10S set up.

Have fun ok! I will be getting a big one up soon too ...