Best Watercooling for socket LGA 1155
What is the best watercooling is there for LGA 1155 and I am using the case Level 10 GT Full Tower ATX
It completely depends on what you mean by watercooling. If you mean a closed loop system then the best you cold do is the h100i. Here is a page about how and where to install various closed watercooling systems in a level 10 gt http://www.hardocp.com/article/2012/09/26/thermaltake_level_10_gt_battle_edition_case_review/5. However, the if you want the absolute best watercooling there is, that would be a custom water loop. A custom loop will take planning and cost quite a bit more, but you will get lower temperatures and you can add your gpu to the loop. I would also recommend looking into high end air cooling for about $30-$50 you can come within a few degrees of the far more expensive closed systems. But, if you really want to watercool, your best options are the h100i or a custom built loop. The h100i will fit in your case, and is only slightly more expensive than the h80i so the h80i is somewhat useless in your situation.
Also I'm sure you already know this, but, if you do not plan on overclocking your CPU any upgraded cooling will be a waste of money.