I finally broke down and tossed a new video card in the ol' Arcade.
I was running an ATI 9650ViVO in it prior. The computer in my bedroom that I used to use for gaming is currently down (sadly i'm using a Dell Optiplex GX260 in it's place... no more gamin in the bedroom). Good news is.... I could pull out the video card and RAM to upgrade the Arcade!
I ended up with an extra 512MB in the Arcade putting it to 1GBG again finally. And yes i know RAM is cheap... well it hasn't been on the top of my list recently, but I do plan on replacing the current RAM and getting a nice 2GB kit.
The video card I upgraded to is a Sapphire HD 2600XT (ATI Radeon), a decent step up from the card I was running.

As for the new games.....
Street Fighter 4 - Now works! I have the Resolution chopped down to 800x600, AA off, and most effects truned down to low or medium. (avg. 56fps)
Need for Speed Shift - NSF Shift loads, but I haven't taken any time to really mess with it. All the new racings games I'm kinda really waiting till I build the racing cabs before I dive more into them.
Dirt 2 - Same thing as NSF Shift, it now loads and I only played it for a second to make sure it ran.
Tiger Woods PGA Tour 2008 - Looks great! Thanks to the new card I was able to beef up the settings (I'm still hooked on this game, it's amazing playing on my Happ 3inch Trackball)
Arcade hardware has been updated / Arcade hardware picture gallery has been added