I have rowed drift boats for 5+ years and rafts for 8+
worked as a white water raft guide for a few
now a drift boat is nice it has all the luxuries and is great on bigger rivers such as the bow
a good raft is much better on the skinny water -most rivers in alberta ! a quality raft is now the only way I will go
I own a Air super puma it has a solid eva foam core floor and a nice fishing frame and is just as easy to stand in as a drift boat .
I run my raft on the bow lots but I also float a lot of rivers you never would with a drift boat
I wouldn't go with anything smaller than a 13ft and if you do some looking around
you can get into a raft much cheaper than a drift boat and you can find a fishing frame for it for less than $1000
storage in a raft can be done with dry boxes and dry bags
seen a few for sale on kijiji from time to time
you also wanna make sure if you get one that its a self bailing raft
the Saturn rafts are junk you would be lucky to get 4 years out of one
Air rafts are top notch
http://www.aire.com/aire/
nrs makes a good boat
http://www.nrsweb.com/shop/product_list.asp?deptid=1129
zebec also builds a good raft and there are local dealers
if you don't mind traveling to the states you can find good deals hear
where I picked mine up from
http://www.mountainbuzz.com/swap/showcat.php?cat=3
feel free to pm me if you want to know more about them
I have had a few now
personally I would go with a 14 ft min