I have BassBox Pro and LEAP5. I don't think much of BassBox Pro and X-Over Pro as a useful software package and you probably can't afford LEAP5.
For that kind of money I would consider
SoundEasy v17. It is a complete suite (including testing for loudspeakers and drivers) and it does everything you want and more.
The downside is the learning curve. Bass Box Pro is far easier to learn, but since Bass Box Pro skips a lot of important details you really need to know what you are doing when it comes to loudspeaker design. TLS Guy uses it, but as he confessed to me, he fully understands its limitations and knows how to compensate for them.
So, in the end you still need to know what you are doing as a designer and why, but once you have that learning under your belt you will get more value out of SoundEasy by a wide margin.
I should add that the formulas for designing a box are well known and not the magic that makes one software package really better than another. The trick to modeling the drivers' behavior is in the driver's model. Bass Box Pro provides a large list of drivers, but the modeling algorithm relies on published Thiele/Small constants from the manufacture. This is not very accurate and the right way is to measure those parameters yourself.
SoundEasy does not contain a library of drivers. You must create it yourself. The accuracy you get depends on how you do that. If you measure your drivers you will get a result that better matches the real world. Measurement is king.
LEAP5 also relies on accurate driver measurements, but instead of using Thiele/Small constants, LEAP uses the driver impedance curves at various power levels and specific mechanical measurements of the driver's motor to achieve a much higher accuracy with the model. LEAP also can use the standard Thiele/Small constants, but the accuracy is less. LEAP also has one of the better diffraction engines.
Crossover design really needs good measurement data to get it right. Again, the formulas are well understood, but the better data you have for the driver, the better results you get.
If you don't have it yet, get Vance Dickason's Loudspeaker Design Cookbook and Joseph D'Appolito's Testing Loudspeakers for a better understanding.