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.
desktop + headphone Sonus faber Toy monitor|REL T Zero|Sony UDA-1|Sony MDR-Z7|Sony MDR-1000X|Audioquest NightHawk|Ultimate Ears Triple.fi 10|Sony NW-A35
ht Sony A1E 65" OLED|Monitor Audio Silver RX6, RX Centre, RX1|SVS SB-2000|Sony STR-ZA5000ES|Sony UBP-X1000ES|Sonos Connect + Peachtree Audio DAC•iT|Panamax M-5100PM
stereo Sonus faber Toy tower|REL S/5|Teac UD-501|Sony TA-A1ES|Sony SCD-777ES|Sony ST-SA50ES|Sony 43" X800D|Sony UBP-X800|Sonos Connect|Furman Elite-15 PFi