I spend a ton of money on adwords and was thinking of trying Msn Ad Center or Yahoo SM which do you folks feel is better? BTW it's a Sports Niche.
go with adCenter. You can get $75 in free clicks as well. You will have good conversions since most MSN users are noobs. They simply buy the PC with Windows installed on it, have MSN as their home page and never change it. they surf the internet only when they wanna buy smth. Not as savvy as google users.