I need help choosing between these 3 HDTV models please

Hey all.

Just got my Panasonic P50U50.
(http://www.amazon.com/Panasonic-VIERA-TC-P50U50-50-Inch-Plasma/dp/B00752VLRC/ref=sr_1_1?s=electronics&ie=UTF8&qid=1346521267&sr=1-1&keywords=p50u50)

First of all there is a noticeable buzzing noise coming out of the back, probably normal but it's quite loud. Also, when I connect my PC to it via HDMI, the resolution blurs and then refocuses every 60 seconds - but not when I'm playing my Xbox. Maybe it's my PC. I don't know if I want to risk getting a replacement sent out if it's going to do the same thing.

Anyways:

Please keep in mind that I am a major gamer and response time is very important to me. The Panasonic I am returning had the best response time I've ever played on for a screen that size. I'm kinda bummed I have to return it.

Also, I hate that Soap Opera Effect that some TV's have when watching movies - if any of these will do that, let me know please!!

Now I'm between these three:

http://www.amazon.com/Samsung-UN46EH5000-46-Inch-1080p-60Hz/dp/B0071NWYP8/ref=sr_1_34?s=tv&ie=UTF8&qid=1346520125&sr=1-34

http://www.amazon.com/LG-47LS4600-47-Inch-1080p-120Hz/dp/B006ZH0LHY/ref=sr_1_29?s=tv&ie=UTF8&qid=1346520125&sr=1-29

http://www.amazon.com/Samsung-PN51E530-51-Inch-1080p-Plasma/dp/B007BG47BE/ref=sr_1_1?s=tv&ie=UTF8&qid=1346520582&sr=1-1&keywords=pn51e535

Yeah I had a feeling. It's not like overpowering but I definitely notice it during quiet scenes in movies and very low volume.

Which television out of those three would you recommend for a gamer if you don't mind? I'm really at a crossroads here.