I have a 60d, 17-55 2.8 efs, 15-85mm, 430exII.
I need more focus points for taking pictures of my young active twins in the house and on vacations. I just want the best quality pictures and was thinking of either getting the 7d or the new 5d mkiii. I need more focus points and better low light iso. I like natural light pics not everything to have flash. If I bought the 5d I would only be able to get one lens and probably the kit but is it too much for me or would anyone have any other suggestions. I am not pro but seem to be the family photographer at all events and parties. I just want to make sure the 5d is the right move or a new lens. (budget within reason under $5k)
For low light performance, the 7D is the exact same as your current 60D. Any significant
upgrade will have to be the full-frame.
The first 'current' full-frame body is the 5D mk2, it has significantly better noise performance than the 60D but its autofocus isn't all that great. Then comes the 5D mk3, which has slightly better noise performance than the 5D mk2 and vastly better autofocus. And more fps. And weathersealing. And so on.
But it's new, and pricy, and since pre-orders are clogged up it might be a while until you can get your hands on one.
But since you like natural light, I'd definately recommend in favor of going full-frame and against going for another crop camera (you're already pretty much at the top of the crop camera lineup with your 60D, anyways). Since you seem to have upgrade demands in the AF compartment, then, I'd recommend against the 5d mk2 and in favor of the 5d mk3. It's a bit of a punch price-wise, but you'll not need (nor be able) to significantly upgrade your camera for at least another 3 years, and even after that, your camera will still work the wonders it will work now.
Also, you'll have to buy new lenses, because your old lenses only work on crop bodies (the 17-55 and the 15-85). A good thing is that a full-frame camera gives more background blur at similar aperture and framing. Therefore the blur you got from your 17-55 can be bested with the f/4 (kit)lens on the full-frame camera. As such you only really need one lens to fill most of the range you used with your old two lenses, and that same lens also happens to be the kit lens with the 5d mk2 and 5d mk 3 (namely the EF 24-105mm f/4L
IS lens). Buying it in the kit, it's very well worth its price.
The f/4 is a step backward in low light performance, but the body is two or three steps forwards. You still end up with a significant increase.
For real low-light shooting I'd recommend you get an extra large-aperture lens. The 50mm f/1.4 is affordable and very nice.
So then you'd be looking at a 5D mk3 with 61 focus points with a 24-105 f/4L
kit lens for about $4300 total, and then a 50mm f/1.4 for $380... Though you'd still be lacking a lens in the tele compartment (which is nice to have for outings). A great choice lens in that range is the 70-300L
IS; a very new, relatively compact and extremely sharp lens with a nice wide reach. Budget wise that'd no longer be under $5000 though (in total). Unless you hadn't yet included the money you can get back from selling the 60D and the two very nice lenses (which do still have decent value even if re-selling). Those together should easily sell for the price of a new 70-300L lens, and then some.