I've got Slamwerks on mine, it was fitted just before they decided to concentrate on developing new stuff and being a supplier of parts and kits rather than fitting their own... I believe they supply now to T2D who will in turn fit you a beam..
Balls'd has been mentioned, not used them personally as yet, but the work always seems to be good and I've heard no complaints...
I haven't heard Creative Engineering mentioned though... I'd say they're worth a look, Also, Red9 could be a wildcard option depending on your desired stance...