You don't need top-of the line stuff, but good boots may be the most important part of your set-up.
You can still rock out on a crap board, and half-ass franken-binders(as long as they don't break), but riding in crap boots suck.
If a boot doesn't keep you warm, or keep your foot secure, then your day is going to be half as fun as you stop to keep warming up your toes, or wear yourself out looking like a gaper when your heels lift up every turn.
I know instructors that rock entry-level Burtons and whatnot, so its not really a question of high/low quality as it is of functional boots.
get ones that fit your feet well, where you can wiggle your toes but can't move your heel when you walk.
King Shit of Turdville