Man, I blew out my passenger side speaker in November also . . . prompted my upgrade to Infinity Kappas all around, hehe. I was just looking for the excuse,
NO WAY Man!!! Don't buy it all local.... you'll save a couple hundred on that much stuff easily!
Doing all that . . . I'd recommend checking out Crutchfield.com also . . . for the Head Unit mainly... but sometimes they run a good deal on speakers too. Not long ago they had a great deal going for the Polk db series . . . great speakers for the price. Was like buy 1 set get 1 free. But, with the head unit they'll include the installation kit, wiring harness, and antenna adapter (Yeah, you'll need all 3) for free.... worth $40+ and with Crutchfield you get guaranteed warranty coverage... and support. So unless you can really save a ton they are definitely worth a look for the head unit and/or speakers.
Now, for the Sub . . . I'd briefly check out Crutchfield because I found a KILLER deal on my Infinity Perfect 12" Sub in their scratch and dent area ... nearly 70% off normal retail... couldn't pass it up. But otherwise you can find great deals at the sites I listed above.
And, for the Amp... you will find those 2 sites listed above WELL worth a visit... depending on what you want... but their amp installation kits are really cheap too, and are of great quality... i've ordered a lot of stuff from those sites over the years... hooking up my Jeep and my Boat!
Let me know if you got anymore questions.... it's great to know that my many high school years spent on car audio was all worthwhile, hehe
