Darrin,
Here's one I did a number of years ago (2007). You can see the image details below the image.
http://members.optusnet.com.au/mrozy...chus_Complex_R
ISO-400 is a good choice. At f/4, 5 minute sub-exposures are plenty. Just take as many as you possibly can. Be sure to take a decent number of dark frames, too. Something that gives you an SNR of 4-5 should be sufficient. That is, betweent 16-25 dark frames. Also, the same for flats and flat darks.
Look forward to your results.
H