I think a minimal sub to pair with these speakers would cost around $350, and $600 would do them justice. While we Audioholic types see that as a viable option, the typical Best Buy customer (and thus, Pioneers marketing dept.) would not understand spending almost twice that cost of a pair of speakers for a sub. Perhaps Pioneer/Jones could do some of their wizardry, but in the end for subs, you have to increase size (cabinet and shipping cost) or invest in a $$amp and a $$driver to handle the power.
Jones had the expertise to work magic with the speakers because he knows drivers, crossovers, cabinet, etc. Subs are simple enough that I'm not sure he brings anything special to the table. An 8" 50W (FTC rating) sub without any special technology is nothing to get excited about.
Jeff, I'm glad to know I helped in your decision to get them. You convinced me to go ahead and get a pair of 41's while NE still had them for $85/pr. So tit for tat, my friend!