I bought the Infinity 605cs speakers off of ebay after doing some research on them. They retail around $269 CAD at most places, so that’s why I went to ebay first. A company in Ontario (Net Liquidation) sells many sets of these speakers (as well as the Infinity 652). They’re used, but this set had been tested to make sure they worked, and there was no visible damage to them. I knew they didn’t have any wires with them, and some pieces might be missing (but they did say that all the speakers and the x-overs were included and that’s all I cared about). I ended up winning the auction at around $70 USD shipped (around $100 CAD).
The only things missing besides the wires and screws were the flush mount kits for the tweeters, but the other mounting adapters were included (angled).
I took my door panels off as well as my knee bolsters and center console so that I could see where the best places to route things were (I should mention that I’m also running an Alpine deck with dual pre-outs and an Alpine 4x50 RMS amp under my driver’s seat). I found a perfect spot for the x-overs. When the center console is out, you can mount them directly in front of the shifter and the console clears it. Right in between the amp and the deck in my case!
The 45 degree mounting kits for the tweeters work great on the triangle pieces where the side mirrors mount. Easy to install because you just have to pop the triangle out and start drilling 
The 6.5" mid-bass speakers are quite a bit beefier than the OEM speakers, so they don’t fit in the plastic surround that comes with the stock speakers. However, I knew I needed a spacer for the window to clear the speaker anyway, so I kept the surrounds and cut the back out of them, so they were essentially just a spacer. Then I just drilled holes in that for the speaker to mount to. It worked great – it doesn’t stick out anymore than the stock speakers, so the grill just pops right back on over top of them and it looks stock!
I used the old speaker wiring for the mid-bass speaker as suggested in previous threads about installing components. Then I just put a new wire from the x-overs to the tweeters.
I soon found out that one of my tweeters wasn’t working – a loose connection inside it that I can’t get to. So I contacted the company that I bought them from (since they said they had been tested and worked) to see about getting another tweeter. It’s a Sunday though so I haven’t heard back from them.
Once installed, I adjusted my deck (set the treble and bass center frequencies to suit the speakers, as well as the levels) and tried out a variety of CD’s. I was astonished. Even with one tweeter, it sounds 10x better than my old Sony Xplodes, and they were hooked up to the same amp I’m using now! Once I get both tweeters running, if I found the treble to be over-powering, I can simply move the positive wires for the tweeters to the next connection on the x-overs and it will put less power to the tweeters. A great feature included by Infinity.
I should also mention that I’m running Ultimate Titanium 6.5’s in the rear off the same Alpine deck as well that provide quite a lot of bass for their size and price.
Even though I don’t have everything tweaked perfectly and I’m only running one tweeter, I looove these speakers and I’m giving them a 9/10! great value! (especially for $100 CAD!) 
o and unhookt how are those rear speakers? I need some new rear speakers and was looking to find something to match my front infinites and by the way I have a 10" in my trunk and bought the box from a local store and it only takes up about a third of the rear part of the trunk (were the trunk becomes narrower towards the seats) and it doesn’t stick out past where it is narrow. I can fit my lacrosse bag (about the size of a golf bag) in my trunk still with plenty of room so just check some local shops is what I would suggest.