Dell Ultrasharp for certain.
- The wide colour gamut is beautiful
- The same panel is used in monitors costing a few thousand
- It has height and tilt adjustments necessary for perfect viewing angle and comfort (I don't know why people will suffer continual neck cramps to save a few bucks)
- Inputs galore, may or may not be important
- The extra USB ports/readers do come in handy (not that it was a selling point for me)
Wife and I each have 2709Ws and I have a U2410 and they all still perform flawlessly after 4 years.
Get a calibration tool too. (I have an i1 Display2 but I think that model has been superseded.)
(Yes, I know, time to accept that "budget" really means "It'd be great if...")
Remember that a monitor doesn't antiquate like CPU, RAM, GPU, etc.