Hi Mattlathrop,
There are a few ways you could go: full-range, passive, or active. I have experimented with a lot of custom DIY full-range driver builds in the past and its really hard to listen to any passive speaker up close after hearing a Full-range speaker at close proximity. In addition to passive speakers a majority of professional studio monitors I have heard I have not been very impressed with. Recently though I cam across a set up that I like better then my own full-range design, the Genelec 8010A. Pair these with the 7040A Studio Subwoofer and you have an incredible combo. These Genelec monitors have a incredible imagining and sound stage that really would be hard to improve upon in any way. The best part about it is the crossover between tweeter and woofer sounds like a full range driver. I will say the transient response is not as fast, but these little guys sound so good at low and moderate listening levels. The speakers are very detailed, and the sound while neutral does have a warm sound signature that is not fatiguing. This speaker has a metal tweeter and would be only the second speaker I have heard that I like the treble (My ears gravitate towards Silk Drivers). Honestly after listening to alot of Hi Fi setups this is one of my favorites. I beg to wager if you tried this combo you would be surprised and very happy. A quick note and word of caution, the speakers by themselves will have a bass that sounds hollow if you don't use a subwoofer with some types of music, but you can pair these guys with even a cheap $200 sub woofer and they sounds fantastic. I know because I tried this combo and I was really impressed. Feel free to reach out if you have any questions.