We prefer OpenCart or even WooCommerce is also fine, as our team already worked on both platforms.
Please let me know how do you want to proceed, as I can also give you our team high level understanding paragraph to make sure that we are both on the same page in terms of requirements understanding.
Just so you know I am flexible in prices, as quality & long-term relationship is more important.
Look forward to hearing from you.
Regards,
YK
LEADconcept
PS: Please let me know, if you want to see some of our recently designed/developed Websites.