Kind of on the fence here. I'm inclined to agree with KC regarding Frazier and the NL pitchers catching up to him. I don't see an .800 OPS bat there unless he makes some adjustments. He was quite a pleasant surprise defensively at 3B and he has enough raw power and baseball smarts that he could probably be a passable starter at 3B with his defense and low .700s OPS that he could probably muster with his current ability/approach. I'm still in the camp that thinks he's a good corner OF as well and he can play 1B. I like the idea of reducing his exposure to RHP and making him more of a 400 PA super-sub who plays all the time against LHP and some of the time against RHP that are decent match-ups for him. On a good team, there are valuable players like that who aren't every day starters at a certain position.
Given that, I'm not necessarily in a rush to replace Frazier at 3B. I think the Reds have bigger problems, 3B is fairly weak in the NL right now and I'm not convinced that an upgrade could be easily obtained given the talent and dollars required. I'd say those resources are better spent on bigger problems where the team would probably get more bang for its resources expended. I'm not really into Sandoval unless he could be had for a song or the Giants would take another heavyweight with a bloated contract like Broxton for him. I do think the idea of him in his walk year might get him in better shape and make him a possibility for a big season, but he'd be a rental so I still wouldn't give a bunch for him. I might add a middling prospect/suspect or two with Broxton (say Corcino and Lamarre for example), but that's as much as I'd go.