You don't -need- to buy the breakout or ArcadeVGA, if you're crafty with a soldering iron and a multimeter (AND SHRINK TUBING!)...
http://pinouts.ru/Video/VGA15_pinout.shtml - Here's the pinouts for a standard vga cable. Wire up the Red, Green, and Blue signals to your monitor, and the Sync (depending on your monitor requirements you'll need horizontal, vertical, or a combination). You should only need one ground to your monitor, from the VGA cable.
Make sure you have a compatible video card, and install Soft 15KHz, and
steal follow Andy's guide for MAME configuration from
http://ultimarc.com/avgainst.html so that your MAME will output at native resolutions.
That's it that's all!
Unless of course you are awful with any of this stuff. Then you might be in the wrong hobby...
