105 (5800) vs Ultegra (8000) Hi Everyone,

I'm looking to upgrade my Sora groupset to one of Shimano's 11 spd. I can currently get full 105-5800 for around $600 and full Ultegra-8000 for just under $1000.

This is going on an aluminum bike so weight isn't a huge deal. I can't really justify the extra $400 for ~150-200g in weight savings. My biggest concern is performance, especially shifting. Is it worth running 105 shifter's with ultegra derailleurs? or should I spend a little more and get ultegra shifters and use 105 derailleurs? Just get full 105 and spend the money on good shift/brake housing (currently just standard jagwire).


Thanks