An Aviat 67 is an expensive beast, though extremely well built. If you were going to use a slide computer, you won't get a better one - the AFE ARC 2 would be another good choice.
I still use my whizzie after over 40 years - it doesn't need batteries so no embarrassing silences when the calculator dies
Also be aware that the electronic ones tend to use the American nautical mile which is a few feet less than the standard one of 6080 feet.
We train with the Jeppesen CR-3 circular flight computer - it is much easier to use than the Dalton/E6B slide thingies, and can be obtained new for around £26 off ebay. As there is a hole through the middle you can put a bit of string through it and use it one handed when you hang it from a suitable place in the cockpit. In our Beavers, there was a convenient hook by the door.
In the absence of the old workbook, which is well out of print, I have done a replacement (PM for details), and we have done an Android app for it as well.