These are all middle class veteran players who play well enough to expect significant contracts. As a general principle, it is a bad idea to pay any of them. If you can get a Shaun Livingston or a Marcus Morris on a cheap deal, that's fine, but anyone wanting to get paid needs to go.
The fact that Smart might be more appealing than most if not all of them only makes signing him a worse idea, unless it is to create a contract to make a trade with. Marcus probably won't be here after next year.