I've used both Furman and APC for professional installs in college classrooms.
I prefer the Furman. They seem like a higher quality build, and rarely die.
I had 1 go out, and it was replaced within 24hrs. Their customer support is great.
Now on to what really matters, I do not know about their 'home theater' products. I do not have 1st hand experience with that product line. I've dealt soley with their Pro power conditioners and sequencers.
As for Monster, I wont buy anything from them ever. Their overpriced, and for more reasons then I care to get into, I don't have trust in thier company.