Don't buy any damsels. It's the old dither fish story. Once you put that damned thing in there it will terrorize any fish you ever wish to keep. and once in they are very difficult to get out of the rockwork without tearing the entire tank apart. I highly recommend that unles it is the damsel that you want to keep (barring anything the store guy said) you just don't bother with cycling the tank with live fish. You are off to a good start with live sand and live rock. Honestly if the rock was pre cured your parameters should come into place in about 2 weeks in their own with no outside help. Don't forget to add the cleanup crew, about 50 small hermits and 100 small snails or 20 turbo snails. Your list looked decent, you will make changes, so I feel the guy that sold you your stuff is a decent fellow. As to monthly maintenance? That is an industry standard. I think it will be more than adequate until you begin to fully stock the tank. This guy is also approachable, not living behind the curtian in OZ, so in any event that you feel something is awry a trip to his shop will set your fears to ease. I do believe in daily maintenance myself, but to me daily means that I look at the tnak and do a visual check. Doesn't mean daily water changes.
Sounds like you are off to a good start. I'd put some faith into your guy as he will know more about what is happening to your tank than we will.
USMC you openly state a falsehood that I do not understand. You claim to never do water changes since your "mature" tank is so settled in. You state that because you add 5g of makeup water each week that should do it. Nothing could be further from the truth and a new hobbyist could believe what you are saying without further explanation of having a giant skimmer or an awesome refugium. I must ask how do you remove excess nutrients from yoru tank? How do you add the proper elements that only a good water change can provide?
Water changes are the best way to remove the build up of harmful wastes. You say that you only add make up water. This causes a buildup of elements over time instead of reomving them as a proper water change would do. Also water changes are the simplest method of replensishment of essential elements that can be used up by coral and fish growth. I'll bet you if you began doing weekly or monthly water changes your tank will perk right back up again. Sounds like comparing an ex athlete to a current one, I did plenty of running in highschool I don't need to run anymore. In fact if you began running today your body would benefit from the extra activity. I must admit that after setting up my tank I feared the water change. it was nothing in my freshwater tank to do a water change but my salt setup intimidated me. A few months ago I bought into a huge order of SPS corals that set me back a couple of thousand dollars. Not wanting to watch them die I finally gave in and began doing water changes. My tank has never looked better. I do 15g a week on a 75g (110g total water volume). Honestly my polyp extension has never been better than before this change. Upped my Mh lighting, no change. Added a Kalk reactor, no change. Water changes? Oh yeah instant growth.