good setup?

If you're going with the 3000 series... I'd buy 2 of the 3002SPL's... then wire the coils in parallel on each sub, yeilding two subwoofers each at 1 ohm.  then wire them together in series.  (You can do the exact opposite too).  The overall impedance will then be 2ohms.  With the "prs=d3000spl amp" it puts out 1000watts RMS at 2 ohms (perfect match).  With the proper enclosure, this will be plenty of power.  You might even consider going with the prs-D5000SPL, which will give you 1500Watts RMS. 

Here's a link to the 5000SPL subwoofer (I guess it's the 5102SPL this year)...

http://www.pioneerelectronics.com/pna/v3/pg/product/details/0,,2076_310069929_297969848,00.html

This particular speaker could handle two of the 5000SPL amps in their externally bridged setup (2amps to 1 sub).

One more thing... rather than using an optima and a cap, use one the Kinetik batteries (cap killer).  www.kinetikpower.com

i am pretty much dead set on these components:

all pioneer

(2) TS-A6981R  6X9's        (1) TS-C720PRS 6 3/4 Component Speaker Package  

(2) TS-W3002SPL  12'' SUBS     (1) PRS-D3000SPL   Competition SPL Digital Mono Amplifier with 2000 Watts Max. Power

And upgrade my power supply with a better batt and alt. Any thing else i should get?