Glen, a couple of other things to consider are the cost of the filter wheel/filters and the weight of whatever you get. Your MN is a great system for the 8300, but the standard focuser will sag a little with a 1.3kg SBIG + filter wheel - Atik is 0.7kg and QHY is 0.5kg, which is much more doable with standard focussers.
Some seem to have had trouble with lower end cameras, but my experience has been that they do the job fine (I have 3x QHY and 1x SX and they have all been acceptably reliable). It seems that even the premium makers produce occasional lemons, so don't let the odd bad report put you off too much.
If you are going to dip your toes in the mono water, it really is worthwhile getting a cooled camera, rather than a mono modded DSLR.
might be worth a read
http://www.iceinspace.com.au/forum/a...p/t-89521.html