Thomson seatposts, they just work, they don't break and you can usually sell them for what you paid for them which is nice!
Sunline V1 bars, perfect shape for me, light and strong and nice and understated.
Specialised Phenom/Romin saddles in 143mm, cos anything else (Charge Spoon especially!) is agony for me.
XT brakes, cos they just work and they've got loads of modulation.
XT 10 speed drivetrain, works faultlessly and 10 on the back really is a lot more useful than you might think and makes 1 if not 2 chainings redundant.
Maxxis Crossmark 2.25 60a, easily the best spring/summer/autumn rear tyre I've used, so grippy and so quick.
FSA Orbit Extreme Pro headsets, same 10 year warranty as a King, but can be found for £30 online (rrp is £90), what's not to like?
DT hubs, have owned various, all significantly better quality and more reliable than Hope/King/Shimano etc. Also the freehubs are relatively quiet which is also a bonus!
ODI Rogue lockon grips, have tried numerous others, nothing else feels as nice or is as secure.
Crank Bros Candy pedals, more float than Shimano which means my knees are more comfortable.
Easton Flatboys Flat pedals, there are lighter and sexier designs out there, but not many (if any) are as grippy, and nothing else is as indestructible.
Tubeless, cos nobody likes punctures, so why not remove the opportunity for them to happen?