I'd still recommend buying a 120/240hz set, as they all come with the option to turn motion enhancement off. If you're experiencing undesired effects from the frame interpolation, you can turn it down or off. Turning it on for single player games where input lag is less important can produce a good-looking effect (in Borderlands 2 and especially Battlefield 3 everything that moved looked very impressive), for MP it can cause issues because you'll want to be as responsive as possible. This is a case where you'll want to test it out perhaps before buying, I had a 120hz set and must admit that there were some moments where I liked to have it on, and others where it absolutely needed to be off. It all depends on the game, and what type of image the effect ends up producing. With many next gen games set at 60fps, I'd like to see how the frame interpolation works in relation to these games.
My recommendation ultimately might be a relatively good-rated LED with 120hz, some sets from LG strike a balance between cost and quality. Samsung are also a good brand but price begins to climb up, Sony is relatively more expensive but they've been making great sets lately. It all depends on budget. I needed the best picture (colour, blacks, shadows, motion) for the best price, so I went with Panasonic plasma for my needs. My biggest pieces of advice for a screen are make you get a big enough size (yes, size matters!) and make sure your screen has accurate black levels/contrast. A screen that makes dark scenes look greyed-over and blacks a shade of grey really grates on you over time. Once you see a set produce beautiful inky blacks, you won't go back.