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.net domains are great IF you have the .com as well.
free poker sites use the .nets so they can advertise on television and everywhere and they have the pay poker sites at their .com domain.
so make a .net free information site to help feed your ecommerce .com version.
I started with .net and managed to aquire the .com later on. I can confirm that even with an established site there is a certain percentage of type-ins that use the .com through habbit. The .com I have is not advertised anywhere and yet people still find me typing it in.
So it is always best to have the .com from a branding perspective at least.