1. Is the Club Nintendo 2011 cutoff date at the end of June?
"On June 30 of each Club Nintendo year, your status will be reset to allow you to begin earning Coins towards the next Club Nintendo year's Gold or Platinum status rewards." - club.nintendo.com
2. When does WiiPlay 2 come out?
June 13, 2011. - nintendo.com
(might get DQIX if that is registerable too as it's on $7)
Dragon Quest IX should be good for 30 coins.
It seems like you have a few options, BnM, all of which should work and provide you plenty of time