I'd have to say bigger is better as I've currently got 4 on a 19" that, unless I switch screens with maximiser, is pretty illegible.
Have you looked at the 26" Iiyama ProLite E2607WS-1. It's not as large as the 28" one you mentioned but may be considerably cheaper and, with a 2ms response time, really looks good.
http://www.iiyama.com/ms_GL/Product/.../2/product/152
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