I highly recommend the Dell UltraSharp U4919, of which I currently have four (two at home and two at work). Almost my entire department switch to them as soon as they came out.
My other ultra-wide is an ASUS PG348Q. It's crazy how that monitor felt huge when I got it, but it just seems tiny now.
My other ultra-wide is an ASUS PG348Q. It's crazy how that monitor felt huge when I got it, but it just seems tiny now.