Once you get the K-1515, you'll probably never use the DPD test in the K-2005 again. And, just to reinforce what 'Mom said: The ONLY difference between the K2005 and K2006 is the FAS-DPD Chlorine test, and the K-1515 takes care of that for you. It's only about another $20. Also you should have a GOOD OTO test kit. Leslies should have one that uses Taylor reagents and measures to 5ppm on the chlorine side, and uses R-0014 on the pH side. If so, this is the same as the Taylor K-1000, which, IMHO, is the best OTO kit you can buy--and the Leslies kit is the Taylor kit in a Leslies box.
Also, if you are testing CYA often, see if Leslies has the CYA reagent: R-0013 and if they have it in a larger size. I buy it in pint bottles, myself.

I actually have the Leslies version of the K2005...but that's because I have about five different "Service" kits of various types, numerous OTO kits, various single tests, including FAS-DPD, CYA, Salt and Copper.

Carl