What tyre width do you want to ride?
The DT RR 1.1 is the most solid rim for tyres up to 700x28C coming in at ~420 g and should handle disc brakes without problems.
If you want to run wider tyres I'd recommend you the DT TK 7.1 (claimed 540 g) or the Mavic A719 (claimed 565 g).
As alternative Sun makes (or made?) the XTC 0° claimed to weigh 470 g, but the pair in my cellar weighs 557 g each.
They look very strong though.
As for the spokes I'd choose DT Super Comps.
Best compromise between weight and durability for 700C disc brake wheels IMHO.
And go for brass nipples: while braking the forces are already high on 26" wheels and they increase once more at 28".
Hubs: if you want to shed some weight compared to Shimano hubs take a look at the new DT 340 Disc
- looks promising and DT hubs have a good reputation in terms of bearing durability.