I haven't heard of to many people using the Cyclone 5, But you won't go wrong with a maze3 or swiftech. Both blocks are high flow blocks. I haven't used the Cyclone 5, but it looks restrictive with all those channels maybe someone here can give you more info on it. The hydothruster used to be available at petwarehouse.com, but it's no longer listed you may have a hard time finding that one. There are smaller and better pumps to be had as far as flow is concerned.
<EDIT> Petwarehouse still has this one.
BIG PUMP