Eizo and NEC are making THE best monitors, but they are really pricey.

Apple (which will run on a PC just fine) Cinema displays are the more affordable "best."

It would probably be less expensive than you think to consider Mac. You can swap a Mac serial number for your Photoshop PC version from Adobe basically for the asking plus shipping.

Just about everything else will either run with Windows on a Mac or exists in a Mac native version.