Yep, we finally gave up and posted the waterbed on Craigslist. New one is an Ikea base and natural latex mattress. The combo seems to work pretty well, though we need a mattress pad as the moisture barrier makes for heat buildup. Sleeps pretty well, minimal wasted space, the drawers are a win, overall I like it.
Damn but mattresses are pricy, though. I like the place we got ours, but the sticker shock was quite something.