Playing in a high standard teams match I pick up the following hand as South:

North is the Dealer, the opponents are vulnerable and we are not. Partner opens 1, I respond 2, West bids 2 and my partner rebids 2. What should I do next after this auction?

     N     E      S     W
    1    P    2    2
    2    P    ?

I could take the view that the Diamonds are behind me and decide to let the bidding die, I could bid No-trumps (either 2NT or 3NT) or I could raise Spades. (Partner has bid freely, remember). What would you do?