I would look at whatever gets you playing more golf. A launch monitor or membership/access to one that gives you good data is a great resource and an asset that you can use and resell later. As for consistency try this... I use something called "differential practice". Purposely hitting it right/left, toe/heel, open/close, high on the face/low on the face. You challenge yourself to develop your "feel" so you can self-diagnose and know what tendencies are happening or you are experiencing. You can challenge yourself simply on the range or ideally using a launch monitor that gives you specific number feedback. As you graduate certain levels then you get more specific with degrees of club face open/closed, swing path, locations on your driver face. Get some foot spray and spray it on your club face and get a feel for where you sit as of right now. Or use a launch monitor with the proper feedback.