I am pretty new to audio and know very little about setups and what not. I just put in a kenwood dnx6960 http://www.amazon.com/Kenwood-DNX6960-Double-DIN-Navigation-Receiver/dp/B0037BHZLQ/ref=sr_1_9?ie=UTF8&qid=1329088834&sr=8-9 because I got a pretty good deal on it, now im looking to upgrade the speakers and put in a sub so I was looking at these

http://www.amazon.com/gp/product/B00022OBOM/ref=ox_sc_act_title_1?ie=UTF8&m=ATVPDKIKX0DER
http://www.amazon.com/gp/product/B002WN2JS4/ref=ox_sc_act_title_2?ie=UTF8&m=ATVPDKIKX0DER
What are your thoughts? Again I have very little knowledge so any comments would be appreciated. I am looking to just get a good low end out of the sub and not use up too much space in my 2008 xlt.