Alternate domain ending for online store?

The .com domain name that I want for my online store is taken. However, every other ending I'd available (.net , .co , .me , etc.). Since I'm planning for this to be my main project for the next 6-12 months at least, I really want a GOOD domain name. Do you think that I should go with .co or .net, or should I just try to find a different .com domain? Normally, I would just go with .net or .co, but seeing as how this will be a really big online store (hopefully) I would jist like to get everyone's opinion.

I have some brandable domain if you want to check my list out PM.

I suggest you get a new .com domain. Maybe like a modifier in the domain name.

I'm with AquaticGamer on this.

If you really plan something BIG, a .com domain is a must.

For a major project. a com is more preferable. unless you are targeting a professional group.
Whereby a ,net is just as good

.com or .net both are good. I would say first .com but if u find a really nice .net go with .net