I would look to speakercraft and as far as polk ,also look to there RT vanishing series,there getting good reviews, have a good warranty. The 255 c,265 rt ,will make a good front stage & 65rt at the rears makes a nice matched set.
And with your walls open now is a good time to build chambers/back boxes,insulation..will improve sound and performance regardless what brand you go with.
For in wall subs ,your gonna have to spend a lot $$ at least a grand, a quality in wall /floor sub should come in its own chamber box and need a separate amp. Your better off with a active sub. You will get way more value and performance for your $$