You can have an awesome website and a high ranking in Google, but this won't guarantee success or high sales. What will, in addition to these factors, is having top of the line shopping cart software. One of the best software on the market is Amazon's, and they certainly have experience in what works and what doesn't after years of research and having a huge ecommerce website presence. Regardless of what shopping cart you buy, however, you will need to keep several things in mind.
Another important consideration is the shopping cart's capacity. This may not seem like a big thing to think about if you are first starting out and only offer 10-20 products. However, do you plan on growing? If so, at what rate? These are things you need to think about and plan ahead for. You don't want to be constantly updating the software due to poor planning. Instead, plan ahead and buy shopping cart software that will last you for at least a few years and the growth rate you project. If you haven't done any kind of projections or made a plan for where you want your site to be in a couple years then you need to do so.
Ease of Use
Look for shopping cart software that is easy to use. This is really important because you want your customers to be able to checkout quickly and easy. Ecommerce sites are well aware of the problems with cart abandonment and that's the last thing you want to deal with. It can largely be avoided by choosing a software that is one page and allows for guest checkout.
The price of the cart software should also be a consideration. You don't want to buy the cheapest on the market simply because it is the cheapest. Instead, you want to buy a shopping cart that will offer you with what you need now in addition to some growing room. This is a business expense and it shouldn't be skimped on because it can affect your business success significantly.
Always read reviews before you make a decision on the software you are going to buy. You never know about certain things until you read the details of other shoppers' reviews. Take an hour or two to investigate what others have said and you will find valuable information that will help you make a decision on the best shopping cart software on the market.