with you being at Level 39 the Z Satins would be huge improvment over the starter clubs. I will always have my 64 Z Satin L39 club, great 50 yard club with super backspin if I need it. Most of the Z Satins are great improvements. As you move up you will find that the high end Clevelands are the most desirable.
Word of caution though, do your homework and know what you need before you start buying just to get a better club. Pay attention to meter speeds and how the club you have your eye on fits with the other clubs in the bag. if your PW is a 100 club look for a 90 wedge, and on down from there, you will be the best just of that as you know how the clubs work for you now. Also, take advantage of the rent option, to try them out before you buy them. Once you pay 200 credits for a club and start to resell it, you will be in for a shock as to what it is worth..nil.