Man $4000 buys some damn good speakers. Off the top of my head these are some you should audition.
Paradigm Studio 40 fronts, 20 rears, CC-590 center
B&W 683 fronts, 685/686 rears, HTM61 center
B&W CM7 fronts, CM1 rears, CM Center
Dynaudio Focus 140 fronts, 110 rears, 200C center
Monitor Audio GS20 fronts, GS10 rears, GSLCR center
Dali Ikon 5 fronts, Ikon 1 rears, Vokal 2 center
For sub either an SVS PB12-Plus or a HSU VTF3 HO
These are just some combinations from speakers I have heard and there are just so many more brands out there to hear. I would go to the following manufacturers websites and see if they have dealers around your area that carry these brands.