I think only you can answer that.
It's the same thing i've asked myself 5 times in the last 12month i believe.
And yes i sell my 3dtv's to fund new ones, i've had baddass sets and rubbish sets, i've had a awsome ld950 and swapped it for a rubbish pz550.
You could do with going to shops and spending a few hours in this and that shop testing what you can.
Couple of things i can tell you from my 1 stint with a 3d plasma, every tv i ever owned has been a lcd.
Lcd looks sharper
Lcd are pretty bad when it comes to a plasma for motion, and this is something i noticed straight away and have had to live with since moving back to lcd, i really can see the motion blur of lcd's now and it does bother me alittle. I've only stated this as you would be moving from a 3d plasma
I know i'll be moving to a 3d plasma again in around 3 month, like to keep my upgrades for at least a few month
So go test, see if your happy moving from a plasma to a lcd.
The best motion handling 3dtv lcd i've had was the ld950, if i could go back in time i'd never of sold it and would still have it now.
Ive had a 3d plasma for 3 days (gt30) I love it in many ways BUT I just cant get out of my head the ease of passive 3d and I'm very tempted to take it back and swap it for the 47" lg w550, however I know the 2d will probably be worse and then the whole motion blur / judder will be apparent !
Watched a home conversion of Transformers: Revenge of the Fallen last night and it was great.
Now I normally hate home conversions so this was a first for me.
Obviosly no pop-outs at all but otherwise the 3D was excellent, with vibrant colours and smooth motion. As is normal with passive, you simply forget you're even wearing glasses which is just as well for such along film