A little reading to get you
started. This should get you thinking in the right direction. Don't take it a gospel but as something to think about. No matter what you finally settle on some will like it, some will tell you how wrong you were. Anything that you get is better than what you have now.
If you live in an apartment you may have the need to move it more often than if you live in a home (move more often). With a collection that is still growing, guessing the size is IMPOSSIBLE. So just get the biggest you can afford at a good quality(your measure of quality). Good Luck!