Hi,
I'd lean towards a Samlex inverter. I'd probably go pure sine wave because some battery chargers don't 'like' modified sine wave, nor do electric blankets in general.
If you do go msw there are lots of el cheapo inverters.
It really does come down to what you wish to run. I don't think that 1000 watts is a good size--it is too small for the microwave--and too large for small loads.
So go small at 300 watts, or go large at 2000 watts.
I used a Cobra MSW 2500 watt for five years with great results but have replaced that with a 3000 watt Magnum pure sine wave hybrid unit.