I've not built any of the RCPowers planes, but I have seen lots of posts over on RCGroups that show them in action, and they seem to fly pretty good. And if you go into the Pusher Jet sections here and on RCGroups, you can find tons of free plans available if you don't want to have to buy them.
Also, there are a lot of kit makers that sell these types of pusher jets. I'm one of them (see the link in my sig). Some others are: