I moved mine to a Samsung 1TB SSD Evo drive which had cost me $450 when I bought it; probably not the most affordable option lol
I used the guides here to take it apart and what not;
And then used Clonezilla to do a direct clone bit to bit over and its insanely faster then any other xbox one x out there. My brothers brought over their xbox one s and x and couldnt even load up or in to games for up to a minute after I had already started playing lol