I didn't do the math on panel count, but I'm going to re recommend an LED wall. A tv display wall bandaged together out of a bunch of cheap tvs is going to be a nightmare. If you can't find someone to build it for you for something in budget then build it yourself!
http://www.led-card.com/p3-91-indoor-le ... binet.html
$450 per panel. I'd recommend novastar cards and a novastar mctrl 660 to run them. Buy extra panels now cause when you get a product like that you may never get more that match in color (though the same can be true with tvs that get updated every year). Even if you don't know how, hire a guy from a company that installs them for 1 day and be labor for him/her.