Bookshelf speaker suggestions for Office

I'll just say up front that I am a complete newbie when it comes to hi end audio. What I'm trying to do is buy some good used speakers, and also a used record player. For speakers, I'm looking to spend anywhere from 400 to 700 dollars. As for the player, I'm open to suggestions. At this point, I am not looking to buy a tube amp, or a better tuner, but definitely in the near future. I already have a decent phono pre-amp for the record player. I would appreciate any advice anyone has. Thanks.