Try to find a clearance Sony 46NX720 from 2011 - I'm sure stock on these is very thin by now, but it's a gorgeous set with a great picture. Samsungs seem to have more picture quality issues and bugs. IMO Sony sets with Gorilla Glass are the best-designed sets I've ever seen.
Sony's 2012 lineup has een reduced and their lower-tier models models (EX640, HX750) are not very impressive. Seems like you have to move up the HX850 or the XBR to get good performance from Sony this year.
Samsung has similarly cheaped out this year, and dropped their Ultra Clear panel from their popular 6-series models, making them matte and dull-looking compared to last year's equivalents.
ht Panasonic TC-P60ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT
lr Panasonic 50ST60, Sony BDP-S5100