Custom Version of Zencart or something Better for T-Shirt Sales

I need a version of Zencart 1.37 or something comparable for t-shirt sales. I NEED THIS SPECIFIC FUNCTIONS. I need when someone buys a shirt they pick the style of the shirt the color and the size....BUT I need the attributes of color and size to be populated by their shirt style selection. Meaning if they select Hanes T-Shirt and available colors are black and white for example then the color attributes box ONLY shows black and white. If the person selects Womens Baby doll shirt and I sell that in PINK,WHITE or Black I need that to appear in the color box......Then if I only offer Small,Medium and LARGE sizes that is in the size box. Basically in shirt I need the attributes to populate eachother based on shirt style section based on the sizes and colors I offer for that particular style. Zencart does offer attributes and values but it is limited on how it works....So i need zencart wuth the above options or something comparable that I can use for many sites. SCAMMERS AND LAZY PEOPLE DO NOT BID. THIS IS A SERIOUS JOB AND MANY JOBS WILL FOLLOW AS I OWN A BIG HOSTING COMPANY AND HAVE MANY [login to view URL] Work to be completed up front and I would like to see WORKING examples before payment. Payment will be made via escrow. Preferably someone USA based that is willing to talk and be dependable. I do not want to spend a fortune considering you probably have this already created. Best shopping cart solutions gets accepted bid and RIDICULOUS prices and cut and paste bidders need not apply.