Is this lag what I have...?

Okay the thread title I chose was meant to make a person smile while thinking about a certain pop culture tuna fish consumer...Now on to the good stuff!

I have been chasing an issue recently and have been informed of this wonderful and informative site where I may seek advice from those whom are much smarter than I am.

I started playing video games online about a year ago. I have a PS3 connected via HDMI to a Samsung PN58A650(T1F) plasma tv. The PS3 is set up at 1080p. I have centurytel(centurylink) internet and use a Linksys E3000 router. My PS3 is wired.
In certain games (Call Of Duty specifically) they provide a "kill-cam" that allows me to see who just slaughtered me. I like to watch these kill-cams for a few reasons but what I am concerned with is this...
When I turn a corner and start walking through a door (just an example) and an enemy pops around a corner, I take aim and pop a few shots to his torso, about that time, he has done the same and I die. Then I watch the kill cam and it appears that the enemy actually popped around the corner, threw a grenade, reloaded his weapon, took a 8ms nap, then shot me before I ever pulled up my iron sights to take aim at him. Obviously this is an exaggeration but I hope my point was made.
I have "re-done" my internet/network, I have purchased shorter cords/cables, I have increased my internet speed, I have spent countless hours on the phone with Linksys making sure that my router settings are correct, I have gone through 2 routers, I have messed with any settings on any component that could possibly make this happen and I am lost.
In a recent article in a video game magazine that I read, a professional gamer was talking about his "battle station" and described his gaming setup and spoke of a gaming monitor as being his choice for its "2ms response time". I have never heard of such a thing as a TV/monitor resonse time but I ask....Is my TV causing this "lag" or is it something else?
My internet speed is ~10mb down and 750kb up, with a ping of ~30ms. I was unable to find the "response time" for my tv to use for comparison.
I am not looking for a miracle but if anybody can provide me some direction as to how to fix this "lag" that I observe while playing videogames online it will help me be a better gamer!

Glad it made someone smile!
Any idea on what is causing the lag? ISP, TV, PS3, etc.?

Thank you very much for the advice. I have previously adjusted the Game Mode setting on my TV and did not notice anything except a contrast/color change (different game, not online, Fallout 3 to be exact). This being said, I took your advice and tried this out and it DID make a difference. I played roughly 8 matches and my average K/D ratio increased from ~1.10 to ~1.5 after making that adjustment AND the kill-cam reflected closer to what I actually saw on my end. So for that, I thank you sir!
As far as the other (peer-peer), I understand what you are saying (for the most part) and I gather from that, there is nothing I can do to improve that on my end. Am I correct in my assessment? If there is anything that I can do on my end to further help my cause, regardless of cost, please feel free to make suggestions! I welcome any and all comments and thank you in advance for them!

Alrighty then, thanks for the comments m8!

Oh thank god, I just wired my whole house a few months back (cat5) and about had a heart attack at the idea of re-wiring it.
I would have further researched it before starting the wiring process over, but man I would have hated to do that...Thanks dude!!

I have a singe button on my remote called "E-Mode". That is where my "Gaming" mode is.
My buddy also has a Samsung and he could not find it anywhere. I pulled up his unsers manual online, searched the PDF document for "gaming" and found it. Then simply told him how to access it! Happy hunting!