Depends on how long of a wire you're talking about. If it's not too long, a standard 3 wire stereo headset extension might do the trick (V+, Grnd, Serial Data) and be cheap. Hook it up, and see how fast it'll go before the data starts to get flakey.
Most off-the-shelf serial LCD modules will only go 'so slow', maybe 2400baud. The slower you send serial, the farther you can send it over a regular chunk of wire. So, if you end up building your own module (which is very very easily done by the way), you could, in theory, make it as slow as you need, or get all sorts of complicated (RS drivers, error correction, the whole ball of wax).
Here's a good start on the whole serial LCD backpack thing:
http://www.picbasic.co.uk/forum/show...erial+backpack
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