The decision to convert to a hook ball depends on your motivation to improve. If you want to be the best you can be, learn to hook the ball. If you're satisfied at around 170, stay with a straight ball. Either way, I would recommend an entry level reactive resin ball, such as the Ebonite Tornado series, Brunswick Power Groove series, etc. Talk to your local pro shop staff, they will help you select one that fits your game. But be wary if they try to sell you a ball that costs more than around $100 out the door. You're not ready for that yet. By the way, along with the decision about hooking the ball comes the finger tip versus conventional grip decision. I suspect you are using a conventional grip now. If you're serious about improving, you need to have your new ball drilled with a relaxed fingertip grip. You may find that with a resin ball and fingertip grip you hook the ball naturally. -- JohnP