Evilking
I "completed" a T205 set a couple years ago.
To me that means I have a base set of all the unique fronts.
As you know, it's when you flip them over when the fun begins!!
The front set took me about 12 years but I am still upgrading, still getting them SGC graded and still gathering rarer backs to some extent...this will probably never end

There are tough variations and back types out there!
I registered a SGC master set (which will certainly be challenging)and I am considering doing a few player runs with various backs. They are my favorite cards of all, and I will just keep going and going as time and money allows