This is a great idea. I ahve a similar set of searches on eBay for when I was buying these things.

You should consider putting some affiliate links in so this continues to exist and grow.

You are helping people save money, which doesn't cost them anything, and if anything makes ebay make less.

I have a ton of ideas for htis that I use to narrow it down even more - starting with the CPU can be a good place. Generation, wattage, etc.