I emailed gigabyte and asus asking about the resolution.
If i am not gaming at all but going to do some photoshop and some slight video editing? you think getting a dedicated video card is worth it or the onboard should be fine assuming it will support the dual monitors?
Z68 has integrated graphics and overclocking (I think... best double-check). P67 overclocks but disables integrated graphics.
The integrated is more than powerful enough: it's overkill if you don't game. However power is not the only thing that matters...
I've only used two monitors with one on VGA and the other on digital. I don't know how that displays handles VGA. If you need two digital outputs, make sure you can do that with integrated graphics (with one on DVI and the other on HDMI presumably). Maybe some boards support it and others don't. Some boards have a single digital output. Also make sure that resolution is supported in dual-screen mode. I've only used two screens at lower resolutions.
If you're not going to use the integrated 3D graphics or to overclock, you're really wasting money on a 2500K. That's the two features you're paying extra for. It's not the same as a regular 2500.