Thanks everyone, I feel confident in the WG D9800 now. I wanted to make sure I didn't buy it and then hear from someone online about why not to get it. Thanks for all of the links, I saved them for future reference.
The monitor is expensive at about $430 after S&H but if I'm doing this I may as well do it right. My concerns were that I couldn't play newer hi-def games or a music program to double the arcade as a jukebox. I think the amount of low-res games I play will far exceed the amount of hi-res games so this will work great. Also, iTunes is fine in 800X600 so this monitor will suit the majority of my needs. One factor in my selection is my cabinet size. I have an old Block Out cab which is about 24" wide so the bare-bones frame of an arcade monitor will be much easier to fit with little modification. I should have held out for a bigger cabinet but I'm a noob and jumped at the first available one.
Good luck with your project. My problem is that I don't have expertise in any of the BYOAC areas. I bought an old cabinet ($160) because I don't trust myself making one of great quality, I bought the X-Arcade Tankstick ($200) to use as starter controls until I learn more about wood-working and control/button wiring, and most of all - unfortunately I'm not a super computer tech so hopefully that side of it doesn't cause me too many problems. I will learn it eventually, but doing this is something you can't pass on. It's just too awesome.
Thanks again!