G'day Carl, Great choice in camera mate.
I would be getting the cheaper remote switch RS-60E3, i think around the $30-50 price range, maybe even cheaper off ebay, depending on your budget maybe the more expensive timer remote.
The AC Adapter kit would also be a good investment, although, i can get a good nights imaging with four of the standard batteries, the memory card fills up way before the batteries die.
As for the memory card, i find the Extreme III 1 gig hard to beat for write speed and capacity.
The biggest expense will be the lenses you choose. I have the 10-22mm wide angle that cost $1000 when i bought it, nearly as much as the camera, but definately a worthy lens for wide field piggy back.
As i said, the lenses will be the biggest investment to get good quality wides.
I hope this helps, can't wait to see some of your images posted.
Cheers.