Hi,
For Hyper V to be used, You must have a processor chip capable of Visualization enabled on it. All processors from Dual Core series of Intel brand supports it. So you can choose any of those which suits your budget.
When it comes to mother board choose which suits that processor. I prefer Intel G35 or D41.
Coming to RAM go for 4GB corsair. It ll be robust. Hard disk, get a 1 TB(not so expensive).
Choose a good SMPS of minimum 350 watts or higher.
Go for a square monitor, what ever may be the size.
Have a nice Day. Rep me if it is useful.