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well i just bought a 20" samsung monitor for my 360, its advertised for up to 1080i but i did notice a slight difference when i changed my xbox settings from 1080i to 1080p.
it was a samsung t200hd monitor but its also available in 22" if you were interested.
A nice one is the 24 " dell S2409W which is cheap and well worth it but i don't think its on sale anymore especially in the UK. I've seen refurbs though for less than