I use Avia.
One thing about Avia, though, is that it has no test pattern you can use to check that "Blacker than Black" data is being passed properly. DVE includes two test patterns that can be used to check that.
If you only have Avia, you should look to see if any of your movie DVDs have the "THX Optimizer" test patterns on them, usual found in the DVD's Setup menu. The Black Level test image in the optimizer, the one with the big "THX" in the middle, can be used to confirm that Blacker than Black data is being passed properly. Other than that, the optimizer should not be used as a substitute for a proper calibration DVD such as Avia or DVE since variations in DVD mastering with different films means the optimizer will also vary and thus will not be as accurate.
To check for Blacker than Black using that "THX" image, *TEMPORARILY* crank up the black levels (Brightness control) on your display and look for a drop shadow to appear behind the "THX" and for extra boxes to appear to the right of the gray scale step boxes along the top of the image. These elements are encoded as "Blacker than Black". If you can see them with the Brightness cranked up then things are working right. Be sure to turn the Brightness back down to the proper calibrated level when you are done since "Blacker than Black" areas should *NOT* be visible when your black levels are properly calibrated.