because of the 8xl, would I be better off w/ the 80 amp or 120 esc/ I won't be using more than 4s
The 80amp should be fine. But if you want a tad more security, and may update your batts later, then get a tad bit bigger esc, it will never hurt having a higher end esc.
"if you've got something to say, say it peacefully"