You can do the drylok, and then the new owners can be screwed. Guess what is peeling off my basement walls as I struggle to come up with the money, patience and time to deal with our basement water problem? Oh; you guessed it - Drylok! With the bitter new homeowner in me out of the way....
I suggest you disclose the problem regardless of how you fix it, and provide the paperwork on how you had it fixed. Drylok isn't a fix in my eyes, it is a cover-up. Since you have just light moisture; You could assess the grading and gutters and fix any deficiencies there; which may alleviate the problem or in some cases eliminate it. If there is a gutter leaking bad or absent; or a portion of the house has bad grading; that water could be collecting around the foundation.
Sorry you have water in the basement; it really makes you pull your hair out...
EDIT: I believe it is called "inward drying"; as the foundation gets wet it needs to dry inwards, drylok locks the water in the foundation. Here is a great read:
http://www.buildingscience.com/docu...nderstanding-basements?topic=doctypes/digests