Speaker upgrade -- Need help!

[TytownR]

I have 99 Camry with 6 speaker.
I recently replaced the radio with JBL 6 cd changer from a Sequoia/Tundra 86120-08130 and amp 86820-0C010. It works fine with the stock speakers.
I think the amp is a 4 x 40 watts (?)
So, I'm going to upgrade with JBL speakers which has 2 ohm impedance.
6.5" for the door speakers and 6 x 9 for the rear speakers like this:
http://cgi.ebay.com/JBL-6-1-2-2-Way-210-Watt-GTO607C-Car-Speakers-GTO-607C_W0QQitemZ150278923265QQihZ005QQcategoryZ18799 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/JBL-6-x-9-Loudspeaker-3-Way-GTO937-Car-Speaker-GTO-937_W0QQitemZ160268543432QQihZ006QQcategoryZ14942Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem
or http://cgi.ebay.com/JBL-6-x-9-2-Way-Loudspeaker-GTO927-Car-Speaker-927_W0QQitemZ160268532505QQihZ006QQcategoryZ14942Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

Question:
1. Will it be okay? I'm afraid the amp can't handle it.
2. Can I use the original speaker wiring?
3. Is there any other amp that will match with this JBL radio without having to do rewiring? Because I think the amp I'm using is for a non JBL system.
Thank you guys!

[hoyota]

The stock wiring will be fine for that amplifier.

If you are planning to replace or use all 6 speakers in the camry, how will a four channel amp work?

[Albuynp Ryeno]

If your going to replace your stock speakers I HIGHLY recommend kfc-x172. Also dont buy 6x9 speakers, they suck. Just buy some particle board, and make a mount for the 6.25s to fit into the 6x9 spot.

Now as for your amp. If your amp is underpowering your speakers, they will still work. Basically the highs will still be pretty loud but you'll have weak mids.

[TytownR]

Hoyota,
I really don't know! As I said it works fine now, all 6 speakers works. The amplifier is a plug and play with the original wiring. So, may be it is not a 4 channel. It already sound better than my stock radio without external amplifier, but I know it can sounds even better with a better speakers. Thanks for your info.

Thanks also to A Ryeno for your recommendation. I will seriously considering it. I'm only afraid that a low impedance will make the amp works too hard and make it stop working. I looked at the original speakers, and it looks like it has 8 ohm impedance. ()
But I'm not sure because the marking on the speakers already fading, hard to read but it says 15 watts 8 ??

I'm not looking for a "BOOM", just a good quality sound to listen to musics, mostly pop rock and some classics.
I also listen to talk radio. And I will never need to top the volume, may be accidentally.

Any other suggestion ?