Dustin, thank you.
Regarding the fisheye vs \"conventional\" UWA-lens - sometimes an image will look more natural when shot with a fisheye, in many cases a rectilinear lens is the one to grab. The mighty and as a zoom unrivaled 14-24/2.8 was my go-to-lens for the last 4 years, but lately I\'ve felt I would shoot every picture the same way when using the 14-24.
Time to re-discover the joys of using a quality fisheye-lens or to play more with stitched panos.
The 20/3.5 or 24/2.8 should make a nice companion to your 14mm. Both lenses are fairly compact and will take a Cokin-P \"slim\" filter holder (or an over-built wide-angle filter) without vignetting. The 20/3.5 is known for it\'s nice way to deal with backlight - the 24/2.8 is more prone to flare.