Make sure the monitor you buy is full HD (i.e. supports a resolution of 1920x1080). I think you can go for 24" screen at this budget. Samsung's monitors are good, but check the stand, they are not very stable
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AMD Phenom II X4 840, 4 GB RAM, MSI HD5670, Corsair CX400 PSU :)
Nokia 5230 :(
Canon IXUS 115 HS :)