Looking to upgrade SYSTEM!!!! HELP

Hi i am looking to make my car system better i have talked to a few fellow tibby members here but haven't really made my choices or really set money for it now i have and i am serious all suggestions i can change in my system let me know.

Here is my current set up ....

Focal 165 V1
http://www.sonicelectronix.com/item_...al-165-V1.html

MB Quart Exp-Series Eta 169 (6x9)
http://www.sonicelectronix.com/item_...t-ETA-169.html

JVC KW-AVX800
http://www.crutchfield.com/S-sVZhuj5...KW-AVX800.html

Diamond D3 AMP (D3400.4)
http://www.sonicelectronix.com/item_...-D3-400.4.html

ARC AMP i do not remember which one, but could be this one.

http://www.goldstaraudio.com/arc-audio-ks-600-2/

Subs are Diamond D3 not sure on those too i think they are these ones

http://www.sonicelectronix.com/item_...io-D312D2.html