Well, I was thinking of getting the 500w so it can cover if I decide to get a sub later.

But, if I get a 200w (up to 4 channel I think) would be enough to power the two 240w speakers and maybe a small 10" sub later on?

Also, aftermarket 6.5" speakers should fit right in, in place of the door speakers right?

I bought some Pioneer Premier component speakers that came with 6 3/4inch 2 way and 1 1/8inch tweeter (we made them fit). We used the brackets of the stock speakers by cutting out the old ones. The crossovers are mounted under the dash. The sound is very good up until the volume level of around 28 when the tweeters start popping. At first we thought the tweeters were blown but we hooked them up to a 200w system and they sounded fine. I am guessing that the impediance mismatch you guys talked about is the cause. The speakers are rated at 4ohms but I guess the head unit is 8 or more?

Anyways I am waiting for the debut of the new Pioneer head units that will be announced this weekend. Hopefully the new ones boot up quickly. The navigation and back up camera will be very nice as the huge blind spot is still scary when backing up.

I personally don't like to hook up components and subs on the same amp. Typically amateur installers are going to underpower the sub and over power the components or cross impedences. I would suggest a smaller more equal (in wattage) 4 channel amp for components and just run a seperate mono amp when you decide to get a sub. Doing this allows you way more control over your system and it tends to offer a lot better sound quality!

Thanks for the info. I'll probably take your advice and go for a smaller amp for just the components.