I used to use APC almost exclusively, but in the last 3 or 4 years have switched to Belkins -- primarily because their more affordable units have AVR, whereas APC's inexpensive units do not.
A friend who bought two Belkins on my recommendation had his home suffer a direct lightning strike last year -- nearly $10K of damage (destroyed two air conditioning units; their refrigerator; and took out a bunch of wiring in the main panel -- but BOTH of his computers were fine :-) Destroyed the Belkin units ... but they did their job - and Belkin replaced them for free. Needless to say, he's glad he listened to me !!
I currently have one APC unit and five Belkin units on my various PC's and HDTV's => the best ones are these (I have 3 of them):
http://www.newegg.com/Product/Product.aspx?Item=N82E16842101225(These units are often on sale for ~ $140 => but can't find them for that right now)
This is also a nice unit for less $$:
http://www.newegg.com/Product/Product.aspx?Item=N82E16842101219 (I have one of these; and one of the 1100va versions of the same)