Thanks for the advice guys.
I have been looking at the company web site: http://www.sc-shop.net/de/index.php
€60 for a complete CPU-only set-up, and the GPU/NB blocks are not too expensive either.
I was going to go the route of getting a heatercore, pump and blocks separately but a basic DangerDen CPU block is €60 alone. Been checking eBay but I'm not sure about buying a second hand block. Sadly all the blocks Silent Cooler make are for 3/8 ID tubing and I would like to try 1/2 ID.
As for space, I have a very large server case so it's not too much of an issue.
Still, if it won't be up to much then I guess I might have to give it a miss. I couldn't find any reviews of any of the kit on the web site for comparison, unfortunately.