Thanks for all of the responses and pm's. I think I've done pretty well, securing an older 76L quad convertible, giving the options of 1,2(?),3,4 fins (cheers Izaak). Thanks to GClark for trial on the twin, and offers of others, but the options of the convertible won out, given the purpose (currently a tri).
Also picked up 2nd hand 4.2/4.7/5.5 Blades (thanks Kazz & The Zu) for a reasonable "quiver" and a new boom(Al). The Blades seem very stable and easy to use, although only a couple of chances to try them yet. Thanks also Marty for his loaner 4.5m which hasn't got wet
Not bad going for under $1900 all up, and ready for more adventures, hopefully BB/East in the not too distant future.

(Although yesterday's conditions might still see me on the beach!)