not a pro, but know stuff a bit a bit.
nice build.
but
changing ur cooler to the next hype thing, deepcool ak620 would be nice. good reviews on keeping things cool. heard 12th gen kinda hot.
and
adding the cpu bending correction thingy something like this is oso good.

no comment on dealer or builder as everyone have own preference. i just like PC.
so glhf !