Fail!!! Just kidding, but.....
Petey, take from a newish owner of a VE Calais also, stay away from Holdens!!! In my ignorance (being my first VE) I too thought Holdens would know best, how wrong I was! I was way overcharged for a service, got limited answers to my questions, and the service was very impersonal. They also didn't pick up an issue with the rear suspension when I asked them to check, which was later checked and immediately diagnosed by a suspension specialist. It was not a major issue, and something Holdens 'professionals' should have seen, but rather, their advice was, "we can't see an issue, but can change the shock and spring for $520!!
Being a novice, I have learnt more from researching these forums, and speaking with specialists in regards to specific issues or queries. You'll find most forum members are also happy to give you there advice and help when asked.
My immediate advice would be to search this forum for similar questions, as I asked a very similar range of questions about 6 months ago, and got some priceless info. GSL in the forum sponsors section is also a good place for information, and they will happily give you their advice if you tell them what you're after. If you decide to go it alone, I recommend calling or visiting at least 3 different specialists in your area and getting their opinions and quotes.
I discovered that bottom line is, if you lower it, you will loose some comfort regardless. This is also affected by how low you go, the quality of shocks/springs, and the tyre size you run. Some short shocks are made more for comfort so there are options available to suit your needs. Speak to a specialist, narrow your options, then search this forum for people that have that particular setup, and ask them their opinions and if they are happy.