I'll be cutting the texture count on the lucy down to a single 2048 res map - which should be a great help to performance, and i'll also be making a mid-range version with about .... 2000 polys - at a guess. This high poly one will probably come in at about 8000 ish.
Oh, and for which ship to do next, i'll be doing up old TI ships for a while after this, but the Poesidon is next on the list, possibly followed by the eleysium, iceni (and thus the breakable-asteroid-station-i-won't-even-try-to-spell), medical frigate and argo in something approaching that order.

Actually - the ravana does sound like a good challenge.
*adds to very long to do list*
