If you're looking for ultimate quality, be sure to buy an inverter that produces true sine wave power, since this is least likely to cause problems for motors, lighting equipment, and electronics. While I can't say I've ever had any problems just battery charging with modified sine wave equipment (which is what most retail store inverters are) the experts seem to agree that pure sine wave is best, but more expensive. Do a Google search for suppliers; they're not hard to find.

Here's a useful web page explaining this:
Wave forms for inverters