Hmm, Scythe Ninja has gained a fairly fearsome rep. It was designed as a passive cooler, but with a 120mm fan or 2, it's right up there with the BT. The Tuniq Tower is a somewhat recent creation but tests have shown that it's way up there too.
You can buy the Ninja here
I did a quick search on the Tuniq Tower on Froogle for the UK, didn't turn up any results. Here's
the manufacturer's site if you want to check it out.
Core i5 750 3.8GHz@1.3v under OCZ Vendetta 2
3x Kingston X25-V RAID0
2x Evga 9600GT SSC SLI
G.Skill Ripjaws 2x2GB DDR3-1600
Corsair VX550w, Ghettoed Antec Super Lanboy