Kinda weird that the 6.2 would cost more, it should be the more popular of the three.
If you are not hucking big bladed spinners or heavy deep cranks, go with the seven over the five. You will get pretty frustrated if you bass fish with a slow reel. Your hand will have to move at a million miles an hour to get stuff moving good. Ask the store if you can return the seven in favor of the more expensive 6.2 if you do not like it before you buy it. I think the 6.2 to 1 reel has a larger capacity, that is why it is more expensive. One more thing to think about is choosing the right or left handed model. Most guys reel left handed with a spinning reel, and right handed with a casting reel.
I have never figured this out myself.
I am right handed, but I buy lefty casting reels. I feel like I am fishing with my feet when I put the rod in my left hand. This is personal preference and a decision you must make on your own, but make sure you like the feel before you drop a bunch of dough on a casting reel.
http://www.fishusa.com/Shimano-Curado-E-Baitcasting-Reels_p.htmlCheck Fish USA out, in my neck of the woods shipping is often cheaper than the sales tax.
I will vouch for these guys on domestic orders, they do a good job and ship FAST. I know how shipping can be in CA though.
I am thinking in buying the curado 301 myself!
Good Luck!