I am thinking of buying this: http://www.usedcalgary.com/classified-ad/2971195&category=stereo-speakers Currently I have a Yamaha HTR-5920 so this doesn't cut it for subwoofers it drives a little 100watt one right now. It has a line out on it but I am trying to find a amp for a decent price. I am ok with used, but it needs enough power to drive this thing. I also don't want something that is a beast as this is a home system...Size is ok just not huge. Any recommendations?