Karls is right, forget the HG, Go for either a REL Stadium III or an ACI Titan II LE, (my favorite sub). Either is far more musical than the Velo.
Integrated amp to Subwoofers
I was wondering what is the best way to connect an integrated amp and a sub, I have a Sim Audio I-5 and I might buy a velodyne hgs-10 which i feel will match well with my nautilus 805's. The integrated has a pre-amp out, can I use that and run it directly to the sub with regular rca cables? I always hear talk about a daisy chain but since I have an integrated I feel like it might be different, thanks alot.