> A Honda Generator costs less, and provides more power. Yes, it is a
> little bit noisier, but its smaller too and you don't have to run it
> all the time.
> 

And if you get something like a Honda EU1000i
<http://www.hondapowerequipment.com/gensup.asp> generator, which is
actually a 12V alternator coupled with a solid-state inverter, you
have the option of tapping the 12V output directly to charge
batteries. From the reviews I've read, the only reported problem with
those little generators is that they're so nice they get stolen from
the job site!