I have a 2011/2 Colnago CX-1 Evo carbon. It currently has an Ultegra 10spd groupset on it. I've just ordered the mechanical 11spd 6800 groupset as the current one is pretty worn out, and I've heard it feels much nicer (plus I want that extra gear!). So the q - how do I check if the free hub will fit? I guess I assumed it would given it's Shimano to Shimano, but I thought it worth checking since a mate said he had some trouble with that previously (grain of salt taken). The current rims are Bontrager RL's if that helps. I'm still learning my way around road bikes mechanically so bear with me if I ask something daft

Next q - wheelset recommendations.
I'm 6ft, 75Kgs, budget of up to Aussie $1000. I ride a mix of Sydney's Northshore and city side hills and usual ride routes for training / fun (150 - 250km+ roughly a week) and commute on the bike too. So they need to be decent strength and I'd def like to keep them light for the hill climbs. I'd expect low profile aluminium (or alum/carbon combo) rims are going to be my best bet (as much as I like the look of deeper aero carbons!). I'd like to stay with clincher format, and aluminium braking surface too.
Willing to look at both off the shelf, or custom built (I don't want to build them myself though). I have already spoken to TWE Wheels here is Syd but I didn't really have much of a clue when i spoke to him so I figured I'd try and work out the general specs first.
Where would you suggest I start folks? It's maze out there when you start looking at wheelsets!!! Thanks in advance.