After lots of experimenting this is the system I settled on. I wear the 2 piece Hollister New Image closed bag along with the Colomajic liners.
1. The closed bag is nice because there isn't a clip to deal with.
2. The 2 piece is nice because the bag just snaps on and off.
3. The Colomajic liners are convenient, cheap and cut down on odor. You just put out the liner and flush it! Put in a new liner and away you go. It's much cheaper than throwing away the closed end bags several times a day.
Option number 2:
Hollister has a one piece Contour I bag that is VERY easy to put on and pull off. If you don't want to deal with the flange on the 2 piece this is a nice alternative.
Option number 3:
For people with permanent colostomies, irrigation avoids all of the above and can be the easiest solution of all!