Any of the model which meets your spec requirements (Full HD, <5 MS) will do great.

Don't pay too much attention to Contrast IMO as its really just a marketing spec. Just know that LED looks much better than the old LCD. Also, better go for size rather than LED if you're having a budgetary constraint.

You might also want to take a look at the monitors connectivity, audio/optical out etc.

As far as models goes, newer ones are introduced into the market every year.