Help regarding buying a new monitor

Hi
i want to buy a new monitor and have it narrowed to
Samsung SyncMaster S27A550H
Samsung SyncMaster S24A300B
Samsung PX370
LG LG-E2360V

Could anyone suggest any better model or should i stick to these?
I am looking for a 23-24 inch monitor and if i dont get a better choice than the above 3 23-24 inch monitors then i may go for "Samsung SyncMaster S27A550H"
Any suggestions would be helpful - budget is max 18000