To find hull
conducive to sail:
Auxiliary sail (although engine-less is considered)
Capable of 7 kt avg on passage
Well founded for oceanic passage
'Liveability' for at least one soul
at or less than $1,000 per foot as measured at waterline.
Challenge is not constrained by age, type material in construction, or condition. However, 'not a total write-off', ie, able to float is desirable. As for 'liveability', anything from 'find comfortable position below decks' to pipe berths to well appointed is a go.
SOG is most important criteria.