One important thing to note, which was mentioned in several other articles referenced on HN over the last couple weeks - the Seiki monitor (TV) only does 30Hz at max resolution. While I haven't personally tried this, I have heard others say this is completely unacceptable and I believe them. So just beware of the limitations of that model.
I have 3 Dell U2412M 24" monitors vertically oriented. They get the job done.