Hello all. Newbie here and I have a question about which boat to start with. I have been a boater for 30 years and am interested in trying out some sailing. The Mac seems like a great first boat and can't make up my mind about what size.There are some 25's which are cheaper than 19's. Specifically, what are tha advantages of the water ballast on the 19 vs. the swing keel on the 22's or 25's. One better than the other? Which would be best for a first boat?Any other thoughts which would assist me in making this decision would be appreciated.Thanks,Bill