I don't know if MRC is still in business; Andy was busted for pedophile charges 8O
If you can spend the extra bucks, I really like the Deltec design (all except their choice of the Aquabee pump). Any reactor that has a twist-lock lid is exceptional to me Korallin's reactor worked fine for me too.
i was looking at the korallin and another made by precision marine...the deltecs look sweet but for the price the LFS here wants for it i would have to sell off one of my kids..i tried to convince my girlfriend into getting me an early christmas gift but im already waaaaaaay over the $300 dollar limit i told her i would spend setting this tank up..hehe