The universally positive comment so far is one I agree with- go diving! That is why you got certified in the first place! As for a good dive buddy , that is one who has good skills and is available to dive with you when you want to go diving. As to classes, I think all continuing education classes in diving have value. You should focus on those that will enhance your skills for the diving you want to to do. The AOW class is good for enhancing and broadening basic skills. I just spent last weekend diving with 4 AOW students and each had a different level of prior experience, ranging from 10 to 80 dives. Each had visibly improved skills after the open water weekend- buoyancy, trim, navigation, kicking style and etc. Don't let the "nay sayers" discourage you from doing what you choose as far as continuing your formal dive education. Of course the value of each class is related to quality of instruction. But you should, and will, learn from every dive, whether led by and instructor, a divemaster, a more experienced buddy, or by you. Congratulations on your certification. Be an active diver!
DivemasterDennis