The old x-star is now called the x-2. Check out the other boats at
http://www.mastercraft.com.
We used to have a 94' prostar 205. We would put 1000lbs of water weight and a lot of people in it to get a good wake. The 01' X-star only needs stock ballast and about 7 or 8 people to get a good wake. Sold the 205 with a tower for.... Can't remember.... around $14,000-$15,000. It had well over 1000 hours.
I've also played around a bit with weighting a 190. It sucked. The wake had a decent shape but it still wasn't great no matter what we did. Some boats just aren't meant to have a big wake.