Both Hitachi and Mits. offer 65" CRT RPTVs yet, and the Mits still offers a 73". Going by what you said about the sets being on all the time, those are probably your cheapest bet. Both offer good pictures, but the Mits. get the bigger 9" CRTs in the 65 & 73" versions. But on their website, it looks like the last year for CRT RPTVs!

2007 has no listings, that may change, but it might not either. Otherwise I'd go DLP or LCOS. You can get around a 70"-ish TV that will be much skinnier than your old CRT, and you said you wanted the biggest size you could get!

Just my $0.02.