I think they sell the CRT ones at Xgaming, and at Happ still.
I am getting ready to build mine, I am just going to use an old CRT television. If you don't already have one, you can get one for free, if you set it up well enough, nobody will ever know the difference but you.
A big trend here is the "Slim" style cabinet which is a skinny cab with an LCD screen. After playing a few games on my LCD monitor and a few on my TV, I can tell you I prefer my tv. Remember that arcade games were played on old low res CRT screens, a lot of them look really pixelated and grainy on high res screens. Some people like this though. I guess its up to personal taste.
My advice is this: set-up mame on your desktop and see if you like the way it looks on an LCD monitor. Then get an ATI radeon 9200 or 9600 on ebay. I got mine for 10 bucks. You just need any old video card with S video or component out and from what I have read, (and I have read a LOT) ati cards are the best for TV out. I suggest you stick that card in and just hook the pc up to a TV an play a few games and see which one you like better. IF you don't like the TV look, you are out like 20 bucks, or better yet, just ebay that thing and you will probably get all your money back minus maybe a buck or two.
If you like the way the TV looks, then just get yourself a used 35 or 27" tv with s Video and power return. Like I said, if you don't have one of these you can probably get one for cheap, if not free. Get a monitor bezel from Happ, viola, nobody knows its a tv except for you.
If you are determined to use an arcade monitor, here is the link:
http://www.xgaming.com/store/arcade-parts-and-accessories/product/wells-gardner-27-d9400-monitor/it'll set you back 600 bucks.
The arcade vga thing you mentioned is a card from
www.ultimarc.com, its a video card that you need if you are going to plug an arcade monitor into your computer to avoid damaging the monitor.
Alternatively, check your local craigslist. In my town, a guy is selling an old Cowboys of Moo Mesa 4 player cabinet with a working 24" monitor in it for 250 bucks. IF you can find a used cab with a working monitor for cheap, you can go that route too.
I want a custom cabinet and I have a free TV so that's the route I am going. Let me know if that answers your questions!