I'd wait for the L52 Nike irons (not really that far away i you get the consecutive days played bonus every day), the L48 R1 driver, L33 Callaway 3w and L40-ish wedges (90, 75 and 60y). You could easily play from the tips with that set. The next upgrade worth coughing up credits for will come in the late 70s (level), with the 3 CG wedges and either Speed bladez, or wait for the L85 Nikes. And then the late 80s are the time to upgrade the driver and 3w, I like both Berthas very much.
Edit: Like I wrote in another thread, the trajectory of those irons you currently own is much to low and they don't have enough spin, so you won't be able to stop the ball on any elevated green.
P.S.: As for the putter, the L35 Ghost was the first club I bought and will probably never part from it. I'm an off ding putter and I couldn't putt with any putter that has more forgiveness than this 1 (totally changes the clicking spot). I love it and I think it's the best value for money on this site, but that's just my opinion.