NVIDIA Quadro FX 4500+Cheap LCDs+Cintiq-all money EVER=3 display solution?

OK.
Last week I received my long-awaited Quad G5 along with my happy NVIDIA Quadro FX 4500.

I am currently running two simple Viewsonic Diplays:

http://www.viewsonic.com/products/desktopdisplays/lcddisplays/xseries/vx924/

In a week my Wacom Cintiq 21ux will be here. ( http://wacom.com/lcdtablets/index.cfm )

My budget is done. I feel a bit stupid now because I thought in the back of my mind, however brief.....quadro...quad...four.... 4 displays! Now, I knew this was wrong, but it doesn't change the fact that I didn't think about it when I ordered everything. So, my question is...

What's the best solution to have all three displays running separately and at a decent quality? A co-worker of mine says that you can just "spit the signal and the mac is smart enough to figure it out, it'll work." That sounds like bull to me. This can't be true, right?

So, given the specs of the monitors... if I HAVE to buy another video card I'd want the two Viewsonics running on it, as I'm sure a much cheaper video card will still use them to their full potential. What would be a good, inexpensive choice that will work with this setup? I'd rather keep the Cintiq on the NVIDIA, as it will be my main work area for everything I do. I like having two monitors side by site for video editing, so I'd rather not take one down just to use the Cintiq.

So, any suggestions?

Powermac G5 Quad 2.5/ several others. Mac OS X (10.4.5)