I use a Duralast 500 watt inverter that I bought from AutoZone for $99. Even though I have a 5,000 watt AIMS industrial inverter, I see no sense running it when the small unit will work for the need at hand.
I've heard from some folks that they don't think a modified sine wave unit works well. Being an electronics tech, I've personally not seen any problems with any of the MSW units I've ever used. All my electronics work fine and there is no noise in my TVs or problems with the computers. That's just my personal experience.
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP