You could also go down the software route - which i know is a dirty word to hardware enthusiasts but you would pick up your choice of sequencer for £200 or less. Obviously you do then need to buy computer (if you don't have one already), a "proper" sound card / USB interface etc (these don't need to be expensive either, but you do want to avoid Creative and other mass consumer gear. Software wise, maybe even go with Propellerheads Reason if you wanted that hardware feel?
What I've recently started getting into is using my ST (which is why I've mentioned it a few times). It isn't without it's issues and I certainly wouldn't recommend it to other people but I'm a nerd and it's fun. Plus it's gotten me back into producing music again.
However I will openly admit that not having used the Cirklon, I might have missed some killer feature. And this is what I'm asking. Aside build quality, which is it that sets Cirklon apart?