Newbie help with speakers for Mac

I am a newbie in need of advice on speakers for my existing system. Would like to find something for under $2K (new or used). Existing components consist of McIntosh MC7100 amp, C712 pre, Arcam CD72 CD player. Musical tastes run the gamut from rock, classical and jazz. Existing speakers are Definitive Tech BP10's that seemed like a good idea the time but are just not cutting it. Any help would be greatly appreciated. Thanks.