Children...
It would be interesting to hear some first hand feedback on how Dan's motors perform- I have noticed them on his site, and he is a stand-up guy for sure, not like Chris at FineDesign (soon to be out of business it would seem).
For an 80amp esc, the 9XL would be perfect, comparable to an MM modded to run on 4s with... a 9XL

in theory atleast.
As for a ~$100 motor, its kinda tricky really. You have the feigaos and Dan's motors in the $50-80 range, or there used to be the Medusas in the $120-150 range, but beyond that there isnt an an awful lot really- noting that isnt some obscure chinese or German brand no-ones heard of at anyrate. A CC2200kv motor from ebay woudl be good, or the 2650kv version even if you gear it down a bit- smaller size can be compensated for with the shorter gearing and higher kv to a fair extent (L can motors in maxxes is nothing new for example).
When you do test the setup Dan sends you, be sure to record the temps during and after the run, taking note of your trucks setup and the terrain/ driving style etc.
Sorry to hear about your Nan too, thats a shitty weekend for sure.