Putting together an almost raw monster...

[ethicsprof]

i like your criterion of 'very good eye appeal' without worrying so much about the grading company's appraisal.
IMHO there's no way to be dissatisfied with such a criterion and there will always be an astute buyer who will want your wares down the road, if you ever decide to sell for reasons of dire financial circumstances,etc.

and perhaps most importantly, remember the always helpful dictum as you continue this admirable quest:
the monster wants you to quit; don't listen to it.
all the best,
barry