I need a $500 Build, if possible

My friend needs help finding a PC, and I simply don't know as much about hardware as I'd like and can't help him. I'd like this to include a mouse that can be used reliably in FPS games, if possible, but I'll take what I can get. We live in the US, if that helps in any way.

It's doable, depending on what you need.

Currently I'm assuming: tower hardware & mouse

Currently not needing: Operating system, keyboard, monitor, speakers, mic, headphones

Will post in a couple minutes with a build.

//edit: http://pcpartpicker.com/p/jBqw8d

Should be a suitable rig for medium 1080p gaming.

Much appreciated. This seems like it'll do fine, but I'll wait for one or two more posts before being 100%. Thank you very much.

+1

According to this video - The Pentium G3258 takes the lead against the AMD Athlon X4 860k.

https://www.youtube.com/watch?feature=player_embedded&v=DVmIVSalP-s

So, I made an edit to your build: http://pcpartpicker.com/p/yjCMmG