Ive been reading up on a few different lenses and I think im more confused that ever now, im currently working with my 200mm kit lens and while the photos I take are ok, they are just too noisy for my liking and id like to make them sharper.

I mainly take photos of AFL, always indoor and low lit (hence the noise with the high ISO) a few basketball games and the one month in Jan when I go to the Aussie Open Tennis which is usually indoors as well.

I use a Sony A380 atm, can anyone suggest anything for me that I can look out for?