I voted for Barq's root beer, but I don't like the fact they add caffeine to it - I generally drink soda, if at all, later in the day and I won't drink caffeinated products then - it messes with my sleep. IBC root beer is good too (I like their Black Cherry but it's hard to find around here - I've had to settle for a local grocery chain's house brand which ain't half bad - black cherry soda makes a great ice cream float or ice cream soda too). Squirt (as mentioned above) is good for a change of pace. I also like Birch Beer, but it is very hard to find a decent brand that isn't artificially flavored.
. As far as the colas go, I generally drink caffeine-free Pepsi. I think the Sam's Club house brand is actually RC Cola which I like as second to Pepsi.
.bh.