Just my two pennies worth:
1. Jenkins
2. Best
3. Jones
4. Gray
5. O'Connell
6. Ferris
7. Warburton
8. Denton
9. Blair
10. Sexton
11. North
12. Roberts
13. BOD (I'm assuming that he'll quickly capture onto some form after his injury, if not, then Tuilagi)
14. Bowe
15. Kearney
16. Hartley
17. Healy? (Can't say I'm an expert on the front row - I don't really know which props are able to play on both sides.)
18. Lawes
19. O'Brien (think he and Lawes would be dynamite off the bench)
20. Phillips
21. Farrell (unless Priestland ups his game)
22. Halfpenny (If Priestland is on the bench and already covering 15, I would consider just having an out and out winger for this spot depending who's on form)