Good quality bladed spokes are great in nearly every way, except for the price. They are so fatigue resistant that you can use the one set for the rest of your life. I got Sapim CX Ray for one of my front wheels. I couldn't afford to get them for the rear! Also, being not the world's most skilful wheel builder, I was worried about not getting high-enough tension from them, but I suppose that should be no problem for a good builder.
2 kg is NOT heavy for a pair of wheels. It is light for your type of bike. It's not very long ago that it would have been considered light even for a racing bike.
DATA FROM MY LITTLE BROWN BOOK...
My best wheels (without skewers):
Front (Chorus, Open Pro, 32 CX-Ray, alloy nipps): 728 grams
Rear (Chorus, Open Pro, 36 Alpine III (DS)/Laser (NDS)): 946 grams
Total: 1674 grams
Another one of my front wheels (Chorus, Open Pro, 32 Race, brass nipps): 764 grams.
But remember these aren't as durable as you want. An extra 200g per wheel WOULD NOT REALLY MATTER. Make up for it by using lighter tyres than you originally had in mind, with ultralight inner tubes. DT alloy nipps on front and rear NDS will be ok if lubed with anti-seize. You'll save 50g from using ultralight instead of standard inner tubes alone.
Warning: weight-weenieism leads to madness. You'll end up spending £3 to save one gram; changing steel bolts to titanium, aluminium or even nylon ones; and drilling holes in everything, including your head to release excess brain gravy.