Hello - I've checked the site, and I can honestly say, it's quite awful as far as coding goes. Here is my proposal: 1. I will build a new design on my server. You will have access to upload products. 2. The site will be fast, no problems, have a good payment gateway and a better customer experience. 3. I'll recreate the pages and even clean up your English and make the site more presentable. Because your budget is so low, you will need to import the products. I will of course set up proper categories and ensure the site is ready for you to sell from. Of course the site will also be mobile responsive.
As for being a Class A or B - won't be possible with an ecommerce site due to the amount of images we need to place. It will run smooth, your customers will like it and have no trouble finding products to buy from it. The site will also be wordpress and be driven with woocommerce. Please let me know at your convenience. Nick