First post, by infiniteclouds
2560 x 1440 -- not only is it more common than 1920x1200 or 1600x1200 monitors but you can easily find ones capable of doing refresh rates well beyond 60hz.
The main things to consider when using an LCD monitor for retro gaming seem to be:
Support 720x400@70hz for DOS
Force 4:3 Aspect
Has VGA connectivity
Does 1600x1200 for Windows 98/XP
For DOS.. my BenQ XL2730z fully supports 720x400@70 and most importantly, has forced 4:3 Scaling options (17" 4:3, 19" 4:3 or custom sizes with smart scaling). I have tested other monitors that have "Aspect" and even "1:1" options and the problem is that since 720x400 is not 4:3 neither setting will give you the correct aspect ratio. An Aspect or 1:1 feature alone is not enough! Aspect will actually be greyed out when the monitor is displaying 720x400 and 1:1 will give you a very small picture that is not 4:3. The forced 4:3 scaling options of the BenQ solve this problem and with the added flexibility of choosing your 'monitor size'. This model also appears to be the last one that has the D-Sub port with all of the geometry/auto-adjust features included. As an added bonus it comes with an "S-Switch" puck that not only makes navigating the OSD easy with a scroll wheel but lets you save custom presets to the 3 buttons on there. This effectively allows you to create dedicated 1-touch buttons for changing your aspect ratio.
1600x1200 Retro Gaming gets a bit complicated. On a modern machine using Display Port, HDMI or DVI-D it can be selected right off the bat, unlike other 2K monitors I've tested. Once you connect through VGA the monitor only supports up to 1920x1080p. However, using NVIDIA control panel I was able to create a custom resolution of 1600x1200@ 60hz with no issue! After all, the screen real estate is still there.
On a retro 98SE machine the same can be done using PowerStrip. It took me a while to figure out how to do it correctly since I am an amateur with Win98 but the end result is that it's possible. Creating a custom resolution of 1600x1200 @ 60 didn't display the resolution. It wasn't until I created and installed a custom .INF with a max resolution of 1920x1200 @ 75 that I was able to choose 1600x1200.
All in all I'm pretty happy with this monitor. The first one I received from Amazon did have 3 dead pixels...but the replacement had none. It also took me a while to get used to the matte anti-glare finish that all of the manufacturers seem to be putting on their TN panels now but otherwise it's a solid monitor that not only gives you great retro compatibility but a 2K/144mhz adaptive sync display for your current rig.
One important thing to note about this particular model if you intend to use it for console gaming is that the current firmware does not support single strobe 60hz when using blur reduction. I can't pretend to understand this but it is something that popped up a lot when researching this monitor and there are many posts you can read about it on the Blurbusters forum. They just came out with a Strobe Utility program for many of the other models this past April and have "Coming Soon" for the 2730 so maybe there will be a tweak or work-around for that eventually.
Also, on a modern system with DOSBOX you can get 640x480 and 720x400 resolutions -- you'll just have to create them as custom resolutions first.