I can't see the pic of the ponies your keeping. I wonder how many? EDIT: Wow I see now that your only keeping 3! Have fun with them!!
I recently made the 'same' choice. I had a collection of about 600 I think (G1&G3) and I've decided which I'm gonna keep: only about half of my collection
Some ponies are just not 'special' to me, so I felt like I don't need to keep those. The G3's that I find the prettiest, I kept in their boxes to preserve them better but I realized I don't enjoy ponies when their just sitting in their boxes. So I deboxed them too
(the ones I'm keeping). It was loads of fun!