garmin or something else

Kelly wrote:

Also, I know how the 396 and 496 differ, but would like to know if you
think the 496 is worth the extra $600. I should also mention that I
like the "6-pack" panel page on the Garmins as a potential backup in
the event of vacuum pump or electrical failure, and wonder how much
difference the faster refresh rate on the 496 makes for this page.

I think the 396 and 496 both update their navigation solution at 1 Hz.

The difference in refresh rate refers only to the graphic screen update
when you (for example) slew the moving map. I stand ready to be
corrected on this point, however.

I have the 396 and it's fine for depicting nexrad. The graphic screen
update is indeed a bit slow if you're navigating with it and frequently
change scales or slew the map around with the cursor.

I think for the uses you describe, the 396 will do fine in a 172. I
wouldn't depend on either of them as a backup for vacuum in a fast,
slippery airplane.