Numeric has better software support than APC in that department.
Numeric 600VA can deliver only up to 360W and 384W from APC 650.I plan to add a 6850 to this rig thats why I am going for a 800VA.
Not all numeric models have reporting option, the ones being sold here(the ex model) does not have them, and you couldn't get the ax model here(maybe online?)
PS: I have a 5850 running on my rig on a APC 650va, gives about 10-15 mins backup easily, why would you need 800va? You don't run your pc during power cut right? I just need time to save my work and that takes about 5 mins max.
One more thing: The software HWMonitor can now report power consumption, battery status etc for APC UPS without any intermediate software, I don't think it supports numeric, so I don't need to run any 3rd party software(powerchute) in my PC.
*i54.tinypic.com/11gspq9.jpg
I don't need a power meter any more