On saying that
I got an Ex Cameronians Eclipse Shocker, and it is superb (how superb will be judged at the end of september) and I know that its twin was still for sale last I heard.
You can spend 5-600 quid on a basic Shocker/Impulse and then have to spend hundreds kitting it up, maybe better to have a look at the secondhand market, get a lot more for your dollar.
Do a search on "toilet sale" in classifieds (Ijust posted new to put it at top of list) look at teh spec on the ICE Eclipse Shocker and give Wee-man a bell. Lot of marker for the money.