Nvidia 3D vision needed to play 3D games?

Native, I can help answer a little about how 3D games look on the Laservue, since that is one of the TVs you're interested in.

I have the L75A91 Laservue (2010 Model) & in order to get 3D, you have to purchase an external 3D adapter from Mits.

I have had the chance to view 3D via DirecTV 3D programming & 3D Blu-Ray movies, also 3D gaming via XBOX360.

DirecTV & Blu-Ry 3D viewing look great. Gaming I only had the chance to play COD4 & Crysis2 for XB360, both were great, but COD4 looked the best of the 2, felt & looked like the 3D was implemented better on it than Crysis2. The 3D to me really added depth & immersion to the game play. Especially on the 75" screen on my Laservue, it's really awesome. The bigger the screen the better for 3D.

Can't compare it to Nvidia's 3D vision, since I don't own that kit, but I am interested in it for my future HTPC build I am planning.

I would suggest to you if you end up leaning towards the Laservue that you get this years model (L75-A94) that was recently announced. It will sport HDMIv1.4 inputs & have the 3D Adapter built into the TV itself & use a new high contrast screen, as oppose to my model (L75-A91) from last year that sports HDMIv1.3 inputs & the 3D Adapter is external & a separate purchase. If you decide on the Laservue, feel free to PM me & I can get you connected w/ some one for a great price when the TV is released this year.

Hope this helped a little.