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I don't think a T1 is the way to go.. If all you need is more downstream bandwidth, you're probably better off with a high speed ADSL connection... Theoretically, cable is faster downstream than a T1...
In practice, they're about the same... A T1 is more constant obviously, but it's a max of 1.54 megabits per second.
A T1 is a great solution if you have upstream problems, but that's not the case here.
You should probably try Bell Sympatico (I know most people think it sucks, I do too, but it depends on your area, I know some people with it, where it's waaaaaaaaaaay faster than cable in the same area.)
If I were you, I'd try bell high-speed, and split that with 2 computers, then split the cable with the other 2 computers, that way you and your brother basically have your own connection.
If you wanted to be really fancy, you could put the 2 connections together in a multi-honed configuration, and share the 2 connections between all 4 computers, but for that you should use a decent router. (You can do it with a linux box, but it's a bit complicated to get working.)
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