I'm sure there will be lots of debate on this, but it's just my opinion to get the ball rolling.
1 Eddy Ben Arous, I rate him very highly
2 Rory Best
3 WP Nel, maybe Dan Cole
4 Joe Launchbury
5 Alun Wyn Jones
6 CJ Stander, should be eligible for Ireland by now
7 Steffon Armitage (I'm not sure...