Well in your first post you said Bubble Master.. then you said Bubble King. That makes a big difference but I'll assume you meant Bubble Master
Are you married to those two? The cone is going to give you more efficiency, they use the same pumps. BM's have been around for awhile so they are a little dated. I owned one for a time an didn't like it because I was constantly having to tune it. When it skimmed it was great, but with the constant fussing over it I retired it and seriously upgraded to a Bubble King 250 Deluxe.
In that price range, you might to look into the I-Tech 200 with the Tunze pump. Hankzilla has one he is in love with, he would sleep with it if he could