Hi jsweet.
Wish i posted a little earlier, but u seem to be on the right track.
I brought the k15 irons from tour pro, and they are fabulous clubs. Also, on the last free rental weekend, i pretty much hired everything in the pro shop for testing purposes. And because i was thinking to buy the top lvlg20 irons, but. After a LOT of testing, i have decided to stick with the k15's, there is no need at all to upgrade from these irons imo, until perhaps near legend or TL . I did recently buy the top g20 driver(lvl81), and the r11 3wood(low lvl) - along with the k15 hybrid and irons, i will not be changing my clubs again at all. it all fits together really well, and the k15's will never let u down, imo.
I tried pretty much the lot ,and i can only find 1 set of irons that compares to them(k15) - the low lvl r11's, which without dout are the best all round irons,(but they work best with a good ball). With that said, all the irons (but the RBZ's) are very much the same thing, its just what u get used to, or like more, such as slower meter etc. Basically saying, once u found a set u like, stick with them, u will not find any or very little difference from other irons.
Putter is the same really. Once u find 1 u can control well, stick with it . I still use the lvl19 spyder, i am very very consistant with it on all green types, so even after trying lots of others, i would just have to learn it all again if i buy a new 1.and i'm about 99% sure i will putt no better in the end.
Drivers have plenty to choise from, just need the biggest thing you can handle,heheh.
And as suggested before, and i think you find out, the ball is actually the little sweetener we are all looking for. After a huge amount of testing, the clubs have little differences in them all in all. The ball is what really makes that final difference. I have been using the WGT GI-S balls. Same as yourself, i don't like any more extra distance from the ball than 1 dot, i think the k15's are very accurate this way. and then the 2dots of spin - for more control, works very well for me. worth a try i might suggest jsweet.(about 85c)
Anyways - GL with your buying, and always remember to have fun
J1sty