Plus one for Nos,
I'm learning that the hard way with my Valiant! I had no idea there was a batch of X hundred boats where the tanks required replacing. Apparently they peeled a section of the deck up to replace the tanks and mine is cracking all over the place where they did a shite job of gluing down the replacement deck section. Looks to me like they just used sikaflex!!!
Anyway, rewiring (removing all the solid core house cable the previous owner used the automotive cable that has degraded to the point where all of the connectors have snapped off) touching up nicks in Gelcoat, replacing the D-ring on the bow that had been smashed off. Anodes, replacement bilge pumps, mooring lines, instruments........ The list goes on!
Good luck with your decision though!