I am in the same boat as you are but After a lot of comparison shopping, research and finally deciding that Pure Sine wave is the only way for me, (with all the sine wave sensitive electronic equipment I have), the price difference between manufacturers was going to be the factor that could make it or break it. If you take two wattage-identical inverters like Xantrex & Outback and compare their functions, you'll find out that certain functions in the inverter will significantly bump the price a bit.
however with the recent prices of Xantrex coming down a tad, the $1900 delivered price of the SW4024 is now in the same price range as the 4KW Outback. Both are good inverters but I picked the Xantrex SW4024.
Hope this helps,
David
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