SeaCraft 20' questions

[Rlbol]

So first of want to say what a great site this is!!
I have been reading and reading post here and now have a few questions.
I am pretty sure I am looking for a 70's to early 80's 20 foot. My question is what are the differences? I have seen what looks like a few different CC as well as a walk around. I have also read about some different models on here as well. So what are the differences? I am mostly looking for a boat fish inshore as well as closer offshore on nice days but also have fun with the family in the intercostal as well as bringing it down to the keys on some weekends. I live in palm beach florida and have noticed a lot of people from this area, I am hoping to also spend some time at peanut island on the weekends with the kids. from the looks of the 23' they seems to be much larger ad deeper gunnels and V then i will need. It seems like it would be a bit of a hand full fishing in smaller canals. Is this correct thinking? Any suggestions and ideas would be greatly appreciated!! Also if any one knows of a decent hull or complete boat at a reasonable price that would be great!