In reply to:

Which of these disks would you recommend for best features, but ease of navigation.

Tough call. I have both. Avia is generally mentioned as being easier to navigate. But, I'm used to DVE so I navigate better in that one. DVE is a little easier on the ears because it uses 75dB as its benchmark, while Avia uses 85dB. DVE is less expensive. Both will do a good job of calibrating your system. If money is a factor, go with DVE. If it's not, go with Avia.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton