you're pretty on point on most of this information.
as for as sintered and extruded bases, you probably
wont need to really worry about it since you're just
getting started and you're not a racer. an all mountain
board is perfect for people looking to advance in riding.
most all mountain boards have a mid ranged flex, so dont
worry too much about that. as far as edge bevel i wouldnt
go anything past 2 because then you're really getting into
a park bevel. you're right on sizing but personally i ride
all my boards a few CM shorter because i have more control
on over my board. on the sidecuts thing i cant tell you
much, i dont know much about that stuff. for bindings, you
have alot of choices. burton makes some really nice bindings
but theres controversy over their durability. i ride the
burton P1s and they're great, although a bit pricy. rome makes
some top bindings and are pretty cheap(in price). i have the
Targas and the 390s and they're amazing. also Rome customer
service is outstanding. ride makes some awesome bindings as well,
but of course there are tons more choices. a few pretty common
boards are the burton custom, ride havoc, ride agenda, rome
solution, Lib tech TRS and tons more. just pick a board you like
google "__________ review" and you should get tons of information.
same with bindings. good luck. and to everyone: feel free to
correct me on any of this.