They want $1700 for basically an off the shelf CZ that has been upgraded with a barrel, trigger spring and put in a chassis. That is alot of $ considering you could get a used DJ build for about or a little more than that. Heck, a guy on here was trying to sell one and all he wanted was $1500 and couldn't move the gun. This was a gun with a .2 guarantee. I personally would not drop $1700 on that gun. If you must have that chassis, buy the cheapest CZ 455 variant ($310), toss the barrel and stock (or sell them, get about $100 combined), get a Lilja drop in ($480 assuming you want it threaded, $50 less if you don't), get the MPA chassis $650, trigger spring $.30 and you have the same gun for under $1500. Use the $200 you saved on some good ammo and have fun.
Other option would be to get the Vudoo, they have a following here. But that is more than $1700.