E-Commerce platforms generally aren't product-specific, so you can sell tech products on any platform. You'll want to really focus on the content though, as you most likely won't be able to compete with the big boys like Amazon and NewEgg on products alone. You need to become an authority on all things tech, and you'll get business because people visit your site to read your content.

Pick a cart that integrates well with a CMS like WordPress and build a content-rich site that encourages users to follow the blog. Social media will also be key. You are going to need to compete on price as well, otherwise people will just read about the products on your site and then go out to Amazon to buy them. Very tough to compete with the small margins the high-volume sellers are using.

So in order to be successful, you'll need to become a trusted authority with a loyal following, get the products to the market before your competitors and at a fair price. VERY tough to directly compete with Amazon on just about anything.