Any decently made post will serve your needs, just as good as any other, just look carefully at the dimensions and hole sizes etc and pick the one that will meet your requirements
You can buy very well made binding posts for between $5 to $10 bucks
Parts Express has some good choices but they gouge on shipping, so try and order when you have a list if you go with them; there are other good suppliers as well (do a search, especially for outfits that cater to the pro sound trade) The guys I like to use for wire charge actual cost for shipping but I don't think they stock consumer type 5-ways
Don't fall for the audio jewelry