Is there a fix out for inconsistent / stuttery performance while operating with a full write cache ?

I am buying a PC so i am looking for what to buy.

Looking in to 250GB SSD like 850EVO, 600p and even 960EVO.

I am average user and I am interested in will i notice a difference between the drives?

I can notice the difference between HDD and SSD but what about the difference between 850EVO, 600p and 960EVO ?