Im looking to replace all the car speaker's eventually, keeping the stock unit, and the stock amp for now.

If i got everyhting correct, then i need:

Front door speakers
http://cgi.ebay.com/NEW-06-INFINITY-KAPPA-60-7CS-6-5-COMPONENTS-270-WATTS_W0QQitemZ290038995385QQihZ019QQcategoryZ32819QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Rear seat speakers
http://cgi.ebay.com/NEW-06-INFINITY-KAPPA-62-7i-6-5-COAXIALS-225-WATTS_W0QQitemZ290038617512QQihZ019QQcategoryZ58025QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Rear deck
http://cgi.ebay.com/NEW-INFINITY-KAPPA-693-7i-6X9-3WAY-SPEAKERS-330Wmax_W0QQitemZ170037369066QQihZ007QQcategoryZ58029QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

im kind of confused on what i need for spacing - are spacers needed to make these fit in the OEM locations?

 

because the new speakers need more depth, and I would spend a little more on speakers if I were you on the front...the rear deck are just the subs you really dont have to replace those

 

That is exactly what I used but I added an Infinity Basslink in the trunk. I think it sounds great. If you are looking for ground pounding, window rattling thump you may want to go another route but this sounds much better than stock and the Basslink fills in the missing bass from the Blose system. here is a link to some pics of my install.
https://g35driver.com/forums/showthr...infinity+kappa

 

ive allready got 2 10's in the trunk witht he stock system. Im just looking to enhance my high's mainly