Re: Helms 24 vs 25???
The 24 - Fixed keel, good head room, spacious for it's size, quick in its day.
The 25 - Centerboard and fixed ballast, good head room only if you get the Pop-up model and use it while anchored.
Both are great boats but have very different characteristics. You need to pick the one that best fits your sailing style and the waters you sail.
Hope this Helps.
Rehoboth Bay/Indian River, DE
S/Y KJ, Helms 25