USA link. You can filter and read reviews:
http://pcpartpicker.com/products/monitor/
I don't think you'll find exactly what you want for that budget though.
*I also saw some monitors with very HIGH refresh rates. Stick with 6ms or lower.
Examples:
1) Overbudget, but 2560x1080, 29"
http://pcpartpicker.com/product/yWX2FT/lg-monitor-29um67
2) $200, 2560x1080, 25"
http://pcpartpicker.com/product/fFGj4D/lg-monitor-25um56p
If you can't increase the budget, you'll have to weight the pros and cons. You can get a 25" but the height might be a bit low compared to a 24", 1080p screen.