There are no OLED screens in sale right now (except of some single small below 20inch which are expensive as hell). Some stores and manufacturers confuse people a bit.
There are only traditional LCDs, LED LCDs (which sometimes people confuse with OLED which is an entirely different technology) and Plasmas.
The first commercial OLED screen bigger than 30 inch is being developed by Panasonic and is supposed to be released sometime in between 2012 and 2014.
There's no motion blur on plasmas. There is motion blur on LCD but they did a good job minimizing it - especially with motion compensation algorithms (100/120/200/240"hz").
It was my main issue with LCDs too. Now the main issue for me is input lag (not the pixel response time).
All image enhancers steal precious seconds between the signal input and output on the screen which makes for example playing games not so comfortable. This year it's unfortunately the case with Sony and Samsung which add over 100ms of input lag. In theory that's just 1/10th of a second but still it's easy to feel that lag while playing games. Some people claim that they can also hear that while watching live concerts/music videos.
Other than that Sony and Samsung this year offer really great TVs. Almost no visible motion blur and fantastic black levels:
Mid-end Sony Ex500 (LCD) to the left and a Panasonic Plasma to the right.
edit: This is the biggest OLED screen that's available in stores:
A few thousand pounds for a 11-inch screen.