Making an online t-shirt store with Wordpress and beyond

I have only been in the t-shirt business for, a long time, and on the internet for a long time too. Still I find it difficult to integrate the perfect website design and order processing interface. I have searched the world over and used many of the payment systems and web design hosting platforms, but every system keeps dragging me in deeper and deeper into their world of tricks and gadgets that end up costing too much money or are cumbersome and difficult to manage on a daily basis. I've tried Google Checkout (being retired), Amazon and eBay and Yahoo(expensive and restrictive), Volusion and Magento and OS Commerce (each has database management issues), Free carts and Zen carts and Wix carts and form based carts and plugin based carts and widget based carts and Woo Carts until I have become gun shy about buying anything since I have paid and wasted so much time playing with the different carts and payment methods to-date. Compatibility with shipping rules and payment processors is always an issue, size and color options are always and issue, image presentation and preview is always and issue, SEO and web indexing is always an issue, quantity based pricing is always an issue and finally security is always and issue. I can never get around to design because I can never leave the world of functionality long enough to worry about how my pages look.

I have been working with Wordpress lately and still I am restricted to the designs that are available as themes, but now I realized that if other people are using the same theme, then it may be seen as duplicate content on the web. Also, security on the server side is risky since Wordpress has been weakened from time to time through my host. Luckily the orders and credit card information is not stored on the same servers and not available to any hacking breach, in fact I don't even have access to the card numbers any longer. I like the fact that I am not exposed to the risk of handling credit cards, although it is inconvenient when crediting charges. Wordpress as a shopping cart is still blog-like and I am not 100% sure that it is worth the time it is taking to get it operational.