As we know, the IQ Tour Nano and the Marvel S both had the NRG cover. What I didn't realize previously until a month of 2 ago was that the Microbite cover from Roto was/is/is supposed to be/is close to the NRG cover from Storm. Makes sense. The Hyper Cell (which has been noted is discontinued) and the Haywire both have Microbite. So, if Microbite=NRG, you have the Hyper Cell, Marvel S, Haywire, and Tour Nano (in roughly that order of aggressiveness as well) to choose from. I have seen the Hyper and Marvel get put away quickly as others have stated between the aggressive core/cover combo. However, the Haywire and Tour Nano have staying power, still are aggressive enough to get you around the corner with an appropriate cover prep, and will allow you to stay with the ball longer than the Hyper and Marvel S.
If I had to choose just ONE, I would go with the Haywire. more diff than the Tour to help kick the corner when you move in, and yet not too aggressive so that the ball blows up the pattern in 5 frames. Plus the Disturbed core used in the Haywire is amazing.