For those in the market, Areca announced a new revision of the 1880 line a few days ago (1882). Pretty much identical to the 1880 series, except for the fact that it's DDR3 now. I imagine performance is going to be nearly identical...you just get the benefit of less expensive RAM (and active cooling on the 1882ix models).
ARC-1882 series controllers sport a dua-core ROC as well.