I've repurposed an APC UPS 725VA for my surge protection and power conditioner.
I think it works great, got an Onkyo NR1008 sitting behind it.
Works great, and added 0 additional cost since I already had it, and it was only sitting around.
There are also settings which you can set which supposedly regulate voltage fluctuation as in under 118v and over 122v and stabilize it back to 120v. Haven't actually tested it to see if it really works, but if it does work, it's a nice feature.