have Forte speakers, with a 200wpc vintage amp, they will almost never be a boomy speaker. Sadly they do not have good punch/slam as they are short throw high SPL woofers, they produce tight accurate bass. That being said, they do like to be at least 10in off the back wall. Have messed with mine for over 2 years, and have settled on 24in off the back wall with 2 subs to add punch/slam. Again, they do not lack bass, you just really can't fee it unless you are running around 95+ db.
As they will be "new" speakers, swapping out the crossovers will give you almost nothing. The Crites XO's are made to give the house sound, if you go with the "gold" upgrade it will change the highs quite a bit. Forte's do not need help there.
The Forte is very good at filling a room with sound, they have awesome sound stage, and imaging. They do not need a ton of power to sing. But they are really revealing, they will let you know if there is any noise in your system, or you have a bad recording.

