Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Just a heads up , there is a photoreal FSX scenery...Kauai by Richard Sorochak in today's download library over at flightsim.com . I've downloaded but have not loaded it up yet . Screenshots look very good . Beware , very large download (424MB)
Rich

I get very good fps on a nearly 3 year old system now, with Richard's scenery.
He has also done the island of Niihau, which is just west of Kauai.
Niihau is much smaller island.
You could try that first and see how it impacts your system.
Take off from Barking Sands on Kauai, and you can see the island across the channel.
It is available for download at LockOnFiles.
You have to register to use the site however:
http://www.lockonfiles.com/index.php
I think it looks very good but I'm still on the fence about getting it, I wonder what kind of performance you can get with it.