You could try The Berkshire, or Swinley Forest, which is adjacent. Also, the three 'W's, Worplesdon, West Hill and Woking, all in the same rough vicinity. All of these are heathland courses, so should be pretty playable even if there has been a lot of rain (which there sometimes is in March).
Of the Wentworth courses, I would recommend The Edinburgh, which is more fun than the West, and an awful lot less expensive. I haven't played St George's Hill or Walton Heath.