Digistore / OScommerce website customization

Hi, I am looking at getting someone to customize my website that runs on the base of OScommerce. The product is called digistore. I want the website to have a more professional and crisper look as well as more up to date. I also need someone that will make the website more secure. i DO NOT have $1000's of dollars to spend so hopefully someone can help me based on what they have done before. We will have to look through all pages and clean up and asthetically. Will need paypal integration looked at as well. The project will involve pretty much changing the whole website's feel. thanks for your time