I've gotta look for something that will run for about 8 hours, preferably without using a generator. That said I've read over some info at RC and it seems this 750W power inverter connected to a car battery seemed to work well (cheapest solution at around $100-200 depending on the battery). I also have a battery tender that I can use to recharge after the outage is over.
Another option was using a Tripp Lite APS750 750W 12V DC to AC Inverter with Automatic Line-to-Battery 20-Amp Charger hooked up to a marine battery, but this would cost upwards of $500 including the marine battery. I can see the value in having a battery transfer/charging unit all in one, but this is money I would rather spend on an MP40...
A generator would be an option if it's very quite as I live in a townhouse complex and need to be considerate of neighbors. The small quiet honda / Yamaha generators I've looked at are all very expensive ~$1000 so that's out of the question.
What do you guys think?