That's what I was hoping for Gerry, I actually went back and read through the first few pages of this thread earlier on today and realised how useful some of the changes I've made along the way would be for anyone else looking to take the plunge into saltwater.
Main things I've found so far:
If you buy cheap gear - you will end up spending more in the long run buying the right gear later.
If you cut corners - you will end up either going back later and fixing them when it is a lot less convenient, or you will live with things that continue to niggle you.
Don't be afraid to try out a bit of DIY rather than shelling out lots of money on big name products. Yes they use better components that the entry level gear but if you're handy you can produce something with equivalent specs for a lot less. Don't pay for work that you can do yourself, you will pay more attention to detail and learn things along the way that will be valuable later.
Don't skimp on your protein skimmer. Very important. One of the most critical parts of your system if keeping corals.
DRILL YOUR TANK. You may not be comfortable with the thought from the start but trust me, you will regret it after starting up and it's a lot more of a headache to do it when you have livestock to accommodate. (been there, done that.)
Take everything slow, this is something I've done from the start with the majority of aspects on this build. Probably the only thing I haven't felt I should change along the way.
Be prepared to spend good money on vital equipment, so you only buy it once.
MOST IMPORTANT POINT:
In my opinion, Marine tanks aren't the fine art that people make them out to be and they don't have to send you broke. Start basic and slow, learn as you go.
There are fine arts to keeping sensitive livestock but if you start with easier things to keep and do your research you will slowly expand your comfort zone and improve out of sight.
Now come on some of you guys itching to bite the bullet, taking snippets of reef-keeping from me, take the plunge, it's much more rewarding in your own tank.