Base shoes:
Since I'm primarily SP, I go through base shoes like Pez. I have to buy a new pair almost every year because either the soles get completely worn out, or the leather or stitching starts breaking. I tried 3N2, but their quality is pretty poor, in my not-so-humble opinion.
Plate shoes:
Honig's and ump-attire.com are both selling the New Balance 450s for $80 to make way for the 460s. They give great protection and support, and they're very comfortable.
Shin guards:
I'm definitely good there. My Pro-Nines are too new to be scuffed up that badly.
Chest Protector:
Still good. Pro-Nine CPU-B.
Mask:
I might want to consider something a little heavier than what I currently have: the Diamond ix3 mask. It's very light and extremely comfortable, but I think I'll need something a bit more solid if I plan on moving up. Plus, it never hurts to have a backup, as masks can still crack, especially if it's really cold out.
Uniforms:
I know people have their opinions on the style of Fechheimer, but I've got pants that are going on their 3rd year without a problem. Their quality and durability are really top-notch. My shirts are still holding up pretty well, but I plan on replacing some of them once ASA switches shirts (I hear a new option is probably coming next year - same style, different manufacturer/material).
Caps: I've got two 8-stitch caps and one 4-stitch. I'm all set.
I'm still working on getting the funds to purchase my new online home, and I plan on having a section there devoted entirely towards this subject. A few of you have already seen the basic plans, but I won't open house until I update the framework. I'll let you know. PM for details.