i learned the answer to this question from reelmechanic:
200D-standard of the line, with HEG
200DSV-D series, Salt Version. it does not have a ported spool (wiffle spool) which is to prevent saltwater from reaching the bearings.
200DPV-D series Power Version. larger handles, HEG, more spool capacity.
100DSV-same as 200DSV, only it is on a smaller lighter frame.
i have pretty small hands so i like the 100DSV best. i also have a 200D and it is pretty big for me, but i still like it.
citica is a great reel by the way! ;D