Definitely Panamax over Monster...i think Monster Power is way too overrated. i have the 4300 and it's way better than i expected. It's not only heavier, it's also well built. Come on! Do you really need an analog meter? I don't know if a UPS is what you need...but if i we're to choose between the Panamax 5100 and the Monster 2500 (there are new 2600's) i would go with the Panamax.