All of my systems include a subwoofer (or two or three or...).
I have a couple off small computer systems in smaller rooms and use small sealed subs in both, a Rythmik F12 in one and a SVS SB12-NSD in the other. I love Rythmik subs and think they are hard to beat for the money, but SVS is no slouch either. The SB12-NSD is an incredible bargain right now. They have been discontinued and heavily discounted. You should add that to your list.
I have a couple off small computer systems in smaller rooms and use small sealed subs in both, a Rythmik F12 in one and a SVS SB12-NSD in the other. I love Rythmik subs and think they are hard to beat for the money, but SVS is no slouch either. The SB12-NSD is an incredible bargain right now. They have been discontinued and heavily discounted. You should add that to your list.