-- Last Updated: Nov-04-12 12:06 PM EST --
Seems to me that you're looking for a hardware solution to a software problem. No 10' kayak is going to do the job you're describing well. Your 14' canoe might, if you learn some different ways to use it - assuming the canoe is of decent design.
Kayaks just aren't practical for pushing through the muck anyway. Too low of a profile and a lack of convenient hand-holds. If you think you might go with a pack canoe, you can get one light enough that you can carry it while packing your gear on your back as well - rather than dragging.
If you really want to upgrade the boat for your described use, look into a decent recreational tandem canoe, ~16' in length. Expect it to weigh about 60 lbs. Learn to paddle it well solo with whatever technique and whatever paddle works for you. Learn to pole. Push it through the muck and cattails to your heart's content - standing with a pole or wading along beside or behind it. Cart it where you can. Drag it where you must. You will find it far more versatile than any lightweight kayak.