This is a really hard question (unless you get diehard fans on here- these tend to be NP people

)
Boards- Starboard or exocet. Good shapes from both, strong and well presented boards.
Sails- Aerotech- good value for money, excellent performance and strong materials thought they arent without their minor problems (and yes i am talking productions not my proto's). KA I love my kaos, it almost made me get a whole range of KA sails but I chose aerotech (pryde monofilm has scarred me for life

).
Fins- Select, I refuse to spend $500 on a fin. I liked FINS from when they were around.
Masts- dunno, I used to be a fibrespar man but now they have been surpassed. I currently use arrows 100's (nice masts but a little soft), fibrespar tidal wave, NP and prototype 100.
Booms- probably still chinook, even though they reduced the quality of alloy in their booms. If i was buying new carbons it would be chinook.
Extensions/bases- chinook, it would be good if they increased their pulley size a bit. The ART's I am currently using are good because of this.
One more thing...
Footstraps- NP all the way, selected straps in their range much better than the majority of other straps available.
Regarding pulling seams on xply sails, maybe it is through an increased amount of abuse that the sailor places on xply (you dont treat it with kiddie gloves as much) and that a monofilm panel would have split whereas the xply holds and pulls at the weakest point.