It never ceases to amaze me the number of times that this subject comes up, and every time it does, it ALWAYS brings in page after page of posts.
For the original poster, it sounds like the LDS is a perfect fit for their situation. The one shop certified them, has sold them most of their gear, has been very gracious (and smart) about servicing gear that wasn't purchased from them, sets up travel for them, comes close to internet pricing, etc, etc.
I have a slightly different situation, and a mix of various local and not so local dive shops and the internet is what is working out for me. I do day and weekend trips for my diving, and frequent several different shops. Several of my big ticket items (single BP/W, can light, computer) have come from the internet. I have had a couple of issues with these items, but the sellers have always done whatever needed to make things right.
All of my regs, wetsuits, fins, masks, and pretty much all of the rest of the assorted crap that I have has come from LDSes, and I have managed some nice prices on most of it.
Service I do pay rather well for, and I don't argue the issue. Overall, it has worked well for me.