Revamping Car Audio Altima?

[Brett]

Ive got a 05 Nissan Altima without BOSE system with all stock.

So far I've got-
Headunit
http://www.crutchfield.com/p_105AVX640/JVC-KW-AVX640.html?tp=5684&tab=review&rvm=ShowAllt

2 sets of these for front and back
http://www.crutchfield.com/p_500SPS600/Alpine-SPS-600.html?tp=105&tab=review&rvm=ShowAllt

I plan on getting subs in the future once I get some more extra money. Should I buy the amp now? what else do I need? any other recommendations? How hard is installation for speakers and do I need to buy any harnesses?

Thanks

 

[Kevin]

you wont need any more wiring harnesses all u will need is a good wiring kit for the amp which should include rca wires power and ground with an inline fuse on the power wire speaker wire and a remote wire its not hard to install its very straight forward just hide ur wires and for the amp its always better to spend more money in an amp than sub woofers if you have the money to buy a good amp do it and find subs that will work with the amp or you can wait and buy subs first and then try to find an amp to work with them the second way is better bt its you choice