Looking for recommendations....

I've got lot's of different butt plugs, but I'm not completely happy with any of them. I'm looking for one that I could keep in for very long periods (days to weeks) of time, only removing for bowel movements & washing up. The thing is that I want as much stretch as possible in the neck area of the plug, while still being able to have good retention. I'd like at least a 2"-2½" diameter neck. It also needs to have the ergonomic shaped base that fits comfortably between the cheeks. It's not to be too long either. It seems like any plug that goes too deep causes too frequent urges for bowel movements. Silicone seems to be the most comfortable for long wear.

So.... what do you suggest?