I suggest using a projector (or multiple?) and building rp screens that look like tvs.
I say this because I built a tv wall last year, and as awesome as it was, it was equally a huge pain. We went for a really macgyvered solution (video cameras pointed at a tv), which was the only way to do in with our budget.
Things I found while researching last year:
There are boxes that will split a signal up onto three screens (like what they do at best buy) and they can be daisy chained, but each will cost you ~$3000. If you don't need the lo-fi look, there are plasma screens that are made to function as a tv wall -- they just
zoom and crop the signal.
Here's the thing: the above alternatives are HEAVY. TVs or computer monitors or whatever are heavy and cumbersome. Assembling and positioning the tvs was the hardest part. Build some fake tvs out of plywood and rear-projection fabric and save yourself a lot of hassle and money.
That's my 2c.