I'm sooooo late to this party but since I recently got an ED I've been checking these out. Huge praise to Bonknuts on this work. NES and Turbo/PCE are my favorite consoles so this is like a wet dream to me.
I would love to see more run and guns as it is my personal favorite genre. It's awesome to see Contra (what about using the Japanese version with English hack for the extra animation). Of course, Super C would be killer. I wonder if Contra Force could benefit by running on NEC hardware?
The game I think would be most bad ass would be Journey to Silius.
Of course, having the NES version of Batman and ports of Turtles 2 and 3 would be amazing as well. I wish I was more smarter and could do some of this software stuff myself.