That Vantablack would be ideal but may run over budget!

VK; I'd have thought that pretty much any modern TV would better an old PJ in terms of PQ & if you were "only" running an 82" screen then it would be a win-win. There are quite a few 75" sets out there that would pretty much give you the square-footage that you're used to.

In fact, I've just dug out an old copy of Home Cinema Choice (Sept 2017) where they test 4 premium sets; 3 OLEDs (LG 65" W7, £8,000 / Loewe Bild 7.65, £6,500 / Panasonic TX-65EZ1002, £6,000) against Sony's larger LCD (75" XE9405, £4,900) & they found the Sony to be the winner.

Presumably any still knocking around could be found for less than the prices quoted, too.

Cinema: Meridian 271, 3 x DSP640 (behind screen), 4 x DSP320 (in-ceiling), 4 x DSP3100 (surrounds), 2 x AC12 (interface). 2 x Perlisten D12s subs, Lyngdorf MP40 processor. DT 145" 2.35 AT screen. Sony VW870 projector & S-T lens, Lumagen Radiance Pro.
Lounge: Roon, NUC, Kef LS50 Wireless + 2 x REL Gibraltar-2 subs

Meridian owner since 1998