Hi guys, thanks for replying. In the end I went for the inbetween and got a 6nm astrodon.. It seemed like a good compromise.
With any luck the camera will be on a plane in a day and the filter a few days after that
Boy its been hard having my observatory finished and all working then finding myself without a camera for a couple of months. Time to get back in and brush out the cobwebs
Thanks,
Jason