I wouldn't use that site for any suggestions overall....very weird sub list. The Yamaha wouldn't be a sub I'd buy particularly. I'd look at larger drivers than 8" generally (subs can be quite large and quite suitable for music at the same time). Around here you're more likely to be pointed at subs from SVS, Hsu, Monolith, Rythmik, RSL, etc. We have a brand new review of this
BIC sub, too. Might help to know more of the things NIN Audio asks first, tho.
I'd look at some of the sub reviews done here as well as some of the articles relating to sub setup first. Maybe check out data-bass.com, too.