There a few non-3D plasmas this year. Since 3D is a pretty standard feature nowadays (you don't pay extra for it), non-3D models are of the lower-end designation.
Panasonic TC-P50U50: 50"
Samsung PNxxE530: 51", 60" - This model uses a Pentile subpixel arrangement and tends to look slightly jagged
LG PA5500/6500: 50:, 60"
The Panasonic will tend to look the best out of the three, but only comes in 50". If you step up to Panasonic's next model, the UT50, you get a choice of 55". Step up to the ST50 and you get a really effective anti-glare filter.
Note that any of the non-3D models have no AR filter and will glare like crazy under the right conditions, especially the LG.
ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, RX1; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D, Panamax M-5100PM
2ch Sony 32" W650A, Sonus faber Toy Monitor, REL T3, Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Apple TV, Peachtree Audio DAC•iT, Panamax MR4300
pc Monitor Audio Radius 90HD, Audioengine D1, FiiO A1
+ Sony 65" XBRX850B, Sony BDP-S5100