Misstammy,
While I don't have any experience with any other brand of pump, I do recommend the pondmaster pumps.
I don't believe they make the size I have anymore(it's the 3600), but it has been running pretty much 24/7 for at least 5 years and it has worked flawlessly.
I will say that not long after I first got it, the impeller broke and damaged the inside, but it was promptly replaced under warranty, no questions asked. Since then, the only thing i have had to do is replace the impeller one time and that was this spring.
And I will admit, my pump has a hard life... {:-P;;due to my DIY inexperience, my poor excuse for a skimmer offers little to no prefiltering, so pretty much everything that get's near it gets sucked up into my skippy, and due to some "accidents" I've even gone out and found it chugging away in 2 inches of water.
My next pump will absolutely be a pondmaster....
Alan