Not bad, I'm a fan if infinity myself, but I haven't heard these so there's not much for me to compare. The 4x6 likely shows that it won't fit due to the difference in the driver. I'd pull out the old one and check the clearances back there. I had the same problem when I put infinity kappa's in my dodge caliber. I had to cut almost the entire back out of the bracket to make them fit because the driver was way bigger than the stock speaker. I'd you're willing to do some surgery it should fit fine, just check before you order.
Other people on the forum have had good luck with the infinity 64cfx which fits in the 4x6 slot. They've got a much better sensitivity rating than the ones you posted, and they'll take more power if you decide to amp them. They are more expensive though. If that's your price range, I'd go with the kenwood KFC-4675C, especially if you're not hooking up to an amp in the back. They'll take less power, but the sensitivity rating is higher, and 20 watts is all you need it to stand up to if you're not running an amp, not to mention you're likely to ruin your sound stage going any higher back there.
As for the fronts, I'd take a look at the Polk DB 652. $80 a pair, highly rated, up to 100W RMS and a good sensitivity rating. I've heard Polk before and they are good, though I've never owned a set, so I'd go to a local shop and test them out.
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