Hi Andtsg,
Most populars activated carbon are Equo (http://www.equoitaly.com/ ), Acquaristica ( http://www.aquaristica.it/index.asp ), Korallen Zucht (http://www.korallen-zucht.de/)
And the most popular Resin for po4 is Rowaphos, no doubt!
I prefere use Activated Carbon occasionally and i prefer never use Resin for po4... only extraordinarily in case of problems, new rocks layout, etc... i prefer don't get over with nutrients and let remove it only by skimmer and bacterial colony without external support.
Deep Sand Bed help me so much to carry on a low cost maintenance. It thinks to all.