Sounds like you are off to a good start, but I would change a few things on your list.
I would scrap the whisper filter idea and just get a protein skimmer instead. They are much much much much better.
secondly, I would definately get LR. 30-40lbs would be sufficient, plus it adds lots of natural filtration.
As far as inverts, you will need a clean up crew, whether it be snails, crabs, starfish or sea cucumbers.
i would get more than just those 2 test kits. I would not only get the ones you mentioned, BUT ALSO PH and NH3, NH2, CA, dkh and ammonia.
instead of only 40lbs of LR, try to get a sand bed of at least 4". This will allow a DSB and provide anerobic conditions that will aid in natural filtration.
Deep Sand Beds Deep Sand Beds DeepSandBeds DSB article - CALFO How Sandbeds REALLY Work by Ronald L. Shimek, Ph.D. - Reefkeeping.com The Natural Mud-Filter Method