Replacement 400d - 650d vs. 6d

[mdmphoto]

I've had 300D, 400D, 40D, 50D, 7D, and recently bought a 6D.  I really, really like the 7D; it is clearly superior to all the xxD bodies I've owned, and it is a fantastic outdoor camera for sports, nature, wildlife and so on.  On the other hand, the FF 6D outperforms the 7D in IQ, low-light, and iso noise.  The 7D has a superior AF system, but to me that just means it is my go-to for the activities listed above.  For indoor shooting, city- and landscapes, portraits, and other instances where any movement is relatively predictable I expect I'll use the 6D.  You mentioned iso 800 or 1600 (?); try very useable 25000 with the 6D!  I mean seriously.  I'm still learning this body's capabilities, but when I shoot with auto-iso at night the body doesn't hesitate to go there and produce great images that are almost completely useable out of the camera.  If iq is your main concern, there is no contest.  Keep in mind that the newer crop-frames will provide better iq than your 400D, but again, they will not match up to the iq of the 6D.  The 6D's AF system requires a bit more diligent patience but your effort will be rewarded with greater dynamic range and all the other things I've already mentioned.  If you decide to stay with crop frames, you might wait and check out the 70D which rumor has it will be released soon, or even just wait a while longer and check out the 7D II which is supposed to come along later this year.  For a wider angle on a crop frame I would seriously consider a 17-55 f/2.8 IS.  It yields fantastic iq, provides some wide angle.  However, it is a 1000. lens not offered in a kit.  Seems we are back to simply buying the 6D 24-105 kit...

[RadioPath]

you could also look at the 5dmk2

The 5d ii is pretty much the same price here, unfortunately. Also, not having used either, the 6d seems to be considerably better for what I need (High-ISO), the Auto Focus migh and I personally find GPS and WiFi to be really neat features (still don't understand why Canon didn't put them in the 700D). Also: I'm used to a Rebel so I'd like the Body to be as small as reasonably archievable...
Forgot to add: Wouldn't want to buy used gear and I don't think they have Refurb stuff here.

They didn't put wifi/gps on the 700D so you will buy the 6D.

That being said the 6D is a great camera, especially in low light situation and you'd be able to take a lot of great photo's with just your 50mm. As far as weight goes, the 6D with a fifty on it feels almost rebel like in weight(but not build quality). If you can swing it though get the 24-105 at the same time because it most cases it's a substantial discount.

Who knows, might be the reason, but then again adding these features would have been significant improvements over the 650D; as it stands now, if I were to decide on a rebel again, I would pass the 700D and go for the 650D (or even 100D, as it's cheaper and looks so cute )

Guess I'll wait for the rebates and see if there is a way to justify the 24-105. The thing is, I'm afraid it might not be good enough when I upgrade next time (in let's say 4-6 years). Maybe better save a bit more and go for the Sigma 24-70 2.8 then? Would also give me a faster lense, although I would have to add a longer prime or a 70-200 for portraits then.

@mdmphoto: The closest thing to wild life photography I did was taking pics of my dog and a few snap shots at the zoo Zero interest in birding and I don't follow any sports (although a few years down the road I might if my son would get into soccer or sth.). How many stops of ISO would you say a 6D has over say a 7D or your 50D? Thanks!