Nice image Dave, I'd agree with Tony about the ISO, you should be able to go to 800 at least. It may also be worth a try with the inbuilt noise reduction on the 350D as it does an automatic dark frame and subtraction. You can also select a capture which saves both a raw and Jpg images so that for now you could process the jpg and later when your processing skills are better go back and have a crack at the raw image..
