Oh man, I just realized that I lost a long reply I had to this thread...here goes another shot...abbreviated.
Is a new angle grinder better than/as good as/worse than a used Makita, DeWalt, etc.?
Cut resistant gloves: yes or no? if yes from where/what kind?
Any specific recommendations for files? links would be great.
I also agree that the warranty is what makes craftsman so top notch, but there are other companies that have stepped up their warranty. Husky and Kobalt to name the biggies, both of whose tools are very good.
I think that a cheap angle grinder will work just fine for your purposes, as long as you're not trying to use it for precision work. They are screeching loud and dangerous as all get-out, so take the advice and get hand protection, eye protection and hearing protection. Also, do it away from flammables. Dewalt and Makita tools are great for daily hard-use tools that you can't have fail, but for something like an angle grinder I don't find that they are worth the money. Just buy another one if it breaks. Also, pay attention to the brushes, even the cheap ones come with extras these days. Don't wear out the brushes and it will last longer. Mine was 9.99 + shipping from HF, with as much use as I've gotten out of it it was paid for long ago.
Don't know anything about the glove debate, I buy the grey heavy leather ones. I nicked the back of my left hand with a cut-off wheel on my angle grinder when I first got it, I don't suggest you do this.
I still say get Craftsman files for the sizes and types that you can. Their selection may be a little limited, but you can probably get by in the beginning. Kobalt tools are rebranded snap-ons, as far as I know, and probably about the same quality as Craftsman. The question is if the warranty is as hassle-free, becuase they don't seem to charge any less. Don't know about Husky hand-tools to be honest. The Craftsman power tools are not worth the cost, in my opinion, unless you get a sale or they have a power tool that isn't available elsewhere in the same configuration that you want (this does happen from time to time).
Nicholson files are good files if you really don't want to buy from Sears. I can't say anything about Husky or Kobalt because I've never used their files. They sell Nicholsons at the Home Depot here, but I'm sure you can order cheaper ones online.