I voted 757, although my comment applies equally to the 767 as well:

Please add the speed tape to the 757/767 ADI, and make it a user-switchable option like the winglets, if possible.  I love the 757, and this would make flying it a little nicer for me.

I also really want to see the 767-400 all-glass cockpit, too!

No major feature requests with the 727, just would like all the bugs "to be addressed in the next update" to be addressed.