Mavic XM819 rims and also I think Mavic Cross (Rides/Max) wheels can be had as V compatable rims which are also UST tyre compatable.
Tubeless is a good thing.
One thing to watch is that you can't mix and match at all with 10 speed. Both Shimano and SRAM changed the pull ratio's again so 10 speed shifters / mechs will not work with 8/9 speed counterparts even from the same manufacturer. Of course Shimano and SRAM don't talk to each other either even if both are 10 speed systems.
"Shadow" mechs are low profile cage and have different cable routing to allow for better clearance and a stiffer return spring to control the chain tension better. They are also lighter. "Shadow Plus" is the new thing where a switch on the mech allows an even higher spring tension and friction stabalizer to reduce chainslap further - this is also a good thing.
SRAM I feel are more industrial but work better when things get mucky. I've changed from XTR (9) to X-0 (10) and have to say I'm sold on the 10 speed setup.
I-spec is a combined shifter/lever mount and handy to tidy up the cockpit area - SRAM use a similar thing called Matchmaker. It is of course only compatable with itself in both cases.
Chainwise my vote goes to KMC. You can get an X10SL chain which is lighter than any of the Shimano / SRAM ones and just a durable in my experience for under £30. Comes with the powerlink too.
+1 for Rebas here too. Very good solid but suprisingly light forks. There are U-turn models which can very easily be dialled in from 85-115mm travel using a simple adjuster on the top of the leg.