Which spin doctor wedge would be the best of the 3 to buy?

(Before you answer I know they are not allowed in tournaments and are cheating. I dont take golf that serious. Just casually go with my friends.) I have the regular irons P-4 but do not have a sand, lob, or gap wedge. I am looking to buy one of the spin doctors because I can't get backspin on my shots close to the green. I would like to get one that would help the ball bite in and just stop where I shoot rather than roll back a lot.