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Mick the purple/blue around the stars could be UV being seen as blue/purple and an "L" filter (which is an IR/UV blocking filter) may solve that. I have just bought one and will experiment on my 40D.
That's my understanding anyway but I am still getting my feet wet too.
F4 is a good choice (some go to F5.6 on that lense) but ISO3200 is a bit high if you can track and go for something longer than 60 sec at least.
If you have obvious light pollution issues, try and capture as close to overhead as possible. I found significant quality improvements this way in terms of LP.
Good luck,
Darrin...
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