you can get one of those decent korean ips/pls monitors... theyre 2560x1440, and can be overclocked to 120hz... they're 27" big though... you can find them for like $300 on ebay
the build quality i heard is subpar, but if you get a good one, nothing can beat it
Some information regarding aforementioned monitors I have learned through experience:
The display panels are high quality LG units.
The frame/bezel/stand are often low quality (stand replacement helps a lot)
Most of the units will only overclock to 65-67Hz. The 120Hz overclockable "2B" versions sell more than double in price on auction sites. For a couple hundred dollars, a swap of a couple PCBs can be made to run the 2560x1440 panel to 120Hz, this also helps availability, as the 120Hz models are rare. A guy in the US sells PCB kits for this purpose.
Modified display drivers must be used to get the 2560x1440 panels to 120Hz. Older graphics cards and SLi/Crossfire setup also require modifications to GPU drivers involving pixel clock speeds.