I am looking for a fast picture and one that isn't blurry. Ok, let me explain, I have kids in swim team, ice hockey and we have lots of inside family gatherings. When I take photos inside my home, they tend to be slightly blurry sometimes and grainy. I have a kodak 740 with a 10x optical zoom. It DOESN'T have image stabilization - could be the problem. I love the way a DSLR takes a fast photo (lag time, I mean?) And it seems much clearer on the screen. I do take alot of photos in somewhat low light.
Only way you are going to be able to take quicker photos is with a DSLR, xti does 3 frames per second and an S5 IS and a G9 do 1.5 frames per second,
If your old canon camera used EF lenses you may be able to use them on your xti to start then you look into some other lenses to suite your needs. From what your saying the things you would like to take pictures of are pretty fast paced and probably not the best lighting in those places and you will need some faster low light lenses which can be pretty expensive.