Wow 200 pieces is a lot! I had much less around like 20-25 x metals mostly. I don't regret selling the majority because it really helped cure the "addiction" and got me by when I needed cash. I do however regret selling some pieces that I may never be able to attain again at a justifiable price like the Romeo 1's and the Mars Jordans I had.
My plan now is to own at least one of each X metal model (any finish) and have them setup to wear and enjoy except for Mars I won't wear those.
Ay, that's one more for you @Lopaka KaMars