Get either a 420 or 440. They are nearly identical. Both are much more user friendly than the dreaded gamma d on the 400. My son had the 400 then went to the 420 . They all throw a similar picture.
Dolby Atmos 7.2.4 Yamaha CX-A5200 Gemstone 200x7 Emotiva upa-500 amps
Oppo 103 panasonic ub820 Ultra HD Blu-ray Jvc RS3000 projector
silver ticket 125 2.35 screen Golden Ear Triton 5 L&R
super center XXL triton 7's sides Emotiva T1 rears
4 RSL C34 in ceiling SVS PB2-plus sub SVS PC13 ultra sub