Here is some VERY good info from one of the best in the business, and I too wouldnt suggest a Sony for the same reason this gentleman mentions as well. Ive seen 3 in person and all 3 had issues with PQ
"42" plasmas:
Front runners are the panasonic SD and HD plasmas. The SD panny proves that resolution is really not critical for good PQ in plasma. Other factors are far more important such as black levels, color fidelity, grey scale etc. No HDCP but new HDCP equipped models are coming this July.
Next is the Pioneer 433CMX (actually this is 43"). Same caveats about black levels, the HD and Elite PRO modes (433HD and PRO800HD) apply with this just as they do with the 50" brother. But this has the same expansion slot as the 503.
The NEC MP3 and MP4 are also highly regarded but are not sold in retail so you will not be able to demo these - unless you call going to the airport or to E*Trade centers demoing
The SD Fujitsu (4233) uses the NEC MP3 glass and also has very good PQ. It has just been replaced with the P42VHA20US which uses panasonic glass so may be even better! This also has HDCP
The HD 42" Fujitsus are ALiS panels (read up on this in the FAQ and also search on ALIS) and have really not been up to scratch except with PAL and HD material. Even so, many ppl prefer the SD Fujistus to the ALiS ones for HD. HOWEVER, the new ALiS panels have been much improved in terms of contrast and phosphor brightness and the newest Hitachi ALiS panel seems to be getting good reviews so maybe ALiS panels are finally worth considering. Model number for the latest ALiS 42" is P42HHA10WS and this has HDCP.
Avoid:
Sony (you may be surprised at that one) as we have not heard anything consistently good so far about their PQ. Even the newer ones.
Consider Gateway, Sampo, Sole'"