For that kind of budget you really need to go out there and audition some speakers. Call around to your local shops and see what they carry. Some brands you may want to hear would be Monitor Audio, B & W, Energy, PSB, RBH Sound, etc. Bring some of your own material to demo and do some critical listening of your own to get a feel of what your taste is like. $5k is just too much to spend without having a listen first.