Just know that studio monitors are pro gear and many, especially the smaller ones, are voiced for accuracy in near field monitoring. So for example, the Yamaha's have non-linear response to gain; as you turn them up, the bass doesn't increase at the same rate as the higher frequencies. This is because they're trying to keep bass from becoming too loud when you're sitting close. I had to take mine apart and modify them to stop this behavior, which involved literally snipping components out of the active crossover. Non-trivial.
Bigger monitors geared toward mid-field listening or main monitors shouldn't have that issue, but they're not cheap. Just don't think that you can get away with the little desktop monitors in a full sized listening room.
For me, monitors aren't a way to save money, they're a way to get better accuracy and more control. With DSP (mine don't have it onboard, but many monitors have this built in) I was able to get mine within ±0.5 dB of the response curve I wanted at the listening position. The imaging I get with stereo, 5.1, and 7.1 is insanely great, but it took years of monkeying with settings and a lot of learning to get my gain structure and room/speaker correction where it needed to be.