That price is quite a bit high.
But hands down, you won't find a boat that compares with the amount of options the Mariahs have. That's why their trademark was "Equipped Like No Other Boat in the World". The Z-Series are the top of the lines, with the most options.
As far as construction and materials, Mariah one-upped the other manufacturers by using 2 to 5 times stronger materials than their competitors during the entire construction process. This would include gelcoat, fiberglass, vinyl & upholstery, etc. That's why you'll see many of these boats still in great shape for their age. Most boats just need a good wax-based fiberglass restoration treatment to look as good as new. Do a search on here for "Meguiars" and you'll find a lot of info regarding their "Fiberglass Restoration Kit". I use it myself every year and have great results.
Now the only downside is, most of the original parts are extremely hard to come by, since the majority of them were made in house. However don't let it discourage you, because we have been able to source either replacements, or repair options, and have a database of them on this site. And if you've got anything in particular you're concerned about, we're all here to help.
Good luck with your boat hunt, and hopefully you'll end up a member of the Mariah family. Trust me, you won't be disappointed.