I had a similar setup at a previous job -- one of the early 39" TVs. It could only drive 4k at 30Hz, but for staring at text, nothing could beat it. It takes a good tiling window manager to get the most out of this setup. By the same token, a good tiling WM also makes a tiny little netbook screen feel much bigger. So I guess what I'm really saying is, use a tiling WM!