The Boba 400% are still very high. Still it has only been a few days since it was released. I still think they'll drop below $200 some time soon and as low as $150 given time, but I could be wrong. There are alot of 400% collectors, not to mention the avid Star Wars Collectors, out there so that might keep prices up.
I really don't think that they will go higher than now, so at least that is an incentive to hold off. And there are alot of the usually Hong Kong / Japanese re-sellers who have picked quite a few of them off Yahoo Japan, so they are going to flood the market in the next couple of days and should have plenty to go arond for every one.
As for me, I have bought one for myself. This will be my third 400% Kub to so along with the Spiderman and Evangelion ones. FYI the Spiderman, which was also limited to 1000 (I believe), doesn't go for much over $90 these days on eBay.