"Cushioning" can be better achieved with an insole designed for that specific purpose. Since almost all hiking boots allow you to swap insoles, there is no reason to get socks for "cushion".
Cushioning also doesn't really help with blisters (though this is hotly debated as you can see herehere).
Thicker socks will help with warmth but there are also other solutions for that, including buying the sturdier boots you already want, using gators, and/or using higher tech materials
So all that being said, just buy thin socks (I use these) and boots that fit well with those socks, and don't worry.