Good Movie Experience Depends 55% on Audio System and 45% on display when they're equally matched. C9 is a brilliant display, what you are looking for is a comparable audio quality. I'm afraid you'd have to raise your audio budget to C9 levels.provide a good movie experience
Otherwise if Budget is not extendable; a decent HTIB from Onkyo, or Yamaha is a good starting point. Jbl S350 Soundbar with Wireless Subwoofer is another good option. Don't waste your budget in FX audio amp in my opinion, YMMV. Step wise upgrade option is good too. Don't buy anything without listening first.