Upgrading my DSLR camera from Nikon D60 to Canon, need low noise on high ISO?

I'm a student photographer, and I also do studio portraits and wedding photography as a profession.
I currently use a Nikon D60, but I'm wanting to change to Canon due to the fact that all college equipment I use is Canon.
I will be selling my Nikon D60 with the kit lens, large camera bag and fixed 35mm f/1.2 lens, but will also be adding a little money (maybe £200-£300.)
I'd like to know what you would suggest if I'm looking for something with low noise levels on a High ISO, as many of the weddings I shoot are indoors and need faster shutter speeds!
So far I have looked at the Canon 550D or 60D.
I would appreciate any advice!

Added (1). I understand that increased ISO means increased noise.
Hence the need to upgrade. I do not want a shallow depth of field at a wide aperture just to get brighter photographs without altering the ISO. I'm shooting weddings indoors, not roses. The noise levels on the D60 are horrendous.

All cameras have increased noise as the ISO is increased.
You need a fast lens to allow more light onto the censor.
This way you can keep your ISO low and shutter speed fast.

Get whatever camera feels good in your hands. Since you shoot weddings, you should have back-up body - a Rebel XS or XSi would be a good back up. Image quality from the T2i, T3i and 60D is pretty much indentical.

The only advice I can give you is to go to the DP Review website and take the time to do some serious study of the Canon reviews, particularly as pertains to high ISO noise performance. I can tell you that the 5D MkII has terrific, clean high ISO capability, but it is certainly out of your price range.

http://www.dpreview.com/...eview.com/

You're gonna have a hard time topping the 60D and trying to come in on a budget.