After reading lot of info on this topic I decided to teak up the stock speakers and sub in my 2010 Rubi. I have the infinity system with the 730n head unit, and found a good deal locally on some Hertz comp. and coax speakers.
I ended up with the JL Audio sup and amplifier.
I am totally impressed with the final outcome, can finally hear some quality highs and much better bass. I know I am still limited due to the stock plastic enclosure running the small 8" but did not what to deal with a bulky sub box taking up to much room like I had in my YJ for years.
I snapped a bunch of pic of the install and thought I would share them.
Got a great deal on the speakers - $200 on both sets of Hertz on Kijiji
The new JL amp, wiring kit with bass knob $240 on Kijiji
Paid $250 for the new sub, 10" heavy gauge sub and the JL 8" sub from a local audio store.
All in for under $700.