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I use seohost.com and I have to say that they are really good. I have Virtual SEO server with them.

kvchosting.com is believed to be one of the best companies for this kind of services.

I think that VPS (small dedicated server) is the best option for ecommerce web sites. I recommend you to use only trusted providers like vpsland, hostingsource etc.

I think that hostwinds.com is not bad for that. Now you need to decide what kind of hosting solution will you be using. I would recommend to have VPS at least for those kind of sites.