Westlake Audio speakers will deliver all that you are asking for. They have been builiding speakers for studios for 30 years. In this application (studio) dynamics,tonal accuracy, and midrange clarity are paramount. Engineers and producers hear the actual voice or instrument live in the recording room and then through high grade microphones (usually anyway) in the studio monitors. If the dynamics and tonal accuracy are not spot on, the producer and/or engineer will notice. Westlake has survived in this tough environment for a long time.
Also, see Mike Fremer's review in the Nov. stereophile for additional information on one of Westlake's hi-fi minimonitors. Trust me, once you've heard a favorite DVD on Westlake's, other home theater speakers sound lifeless - no matter the pedigree or the cost.
Use your ears - not the reviews, and you will find a great speaker (Westlakes or another brand of your liking). Don't buy something just because it is well reviewed or popular. Work with good dealers in your area and listen to various products and price ranges. Always use material you are familiar with - and don't assume that you "know" what the material is supposed to sound like. Once you listen to enough speakers, you will start to zero in on the best from the various sets of compromises inherant in every speaker design. Hopefully, you will find a speaker that gives you the fewest compromises and the best sound. Keep in mind that what sounds best to you, may be different than what the dealer likes best or what certain reviewers like best. If you can, take along a female friend. They (females) tend to have better hearing and may pick up on major flaws. If you are a female - take a friend to help you confirm your observations. Anyway...enjoy