I purchased the Supertop NX by Bestop without doors in August 2011. The part number is BST54723-35. Total price online was $875.89. There was no tax and the price included shipping.
The instructions were marginal and it took nearly four hours to install with the help of a neighbor.
Don't lose or misplace anything. Bestop only provided the minimum amount of screws, nuts, bolts and bushings. I dropped a plastic bushing and have had a difficult time finding a replacement. For this amount of money, Bestop could provide additional parts.
I had the top on for nearly 3 months until I took it off in November for the winter. I was able to disassemble the top in 10-15 minutes by myself.
Overall, the quality is excellent and it works very well.