Cube Cart Expert

We need an ecommerce website selling computer parts. Using Cube-Cart is preferred as it has most functionality that we are looking for. We would be requiring Merchant Gateway configurations via Paypal and Protx. We do not like the standard cube-cart templates as they are too general so give us something that has professional and clean look. You would need to build some extra functionalities in the Cubecart like Customize PC Order form wherein a customer can Select from various parts of computer to design his computer and when click calculate then it calculates the total for him. Then he can click add to cart to add all items at once. We will get licenced version of cubecart so no need to unbrand it. Other functionality that we need is a few other customizations like 1) Currently if you have a Subcategory under a category and you have products in that subcategory then when you click the main category it will say no products as the products are in sub-category. We want that when someone click on main category then he sees all the product of that category + all the products of all the subcategories inside it. 2) Search by Brand. Though OSCommerce have this but we want same in our cube-cart site. We like the simplicity of cubecart for this site. 3) Selling of Digital Products like software download: Though it's already present but we need enhancement in the sense that currently the disabling is there after particular no. of times in cube-cart. We want to actually determine if he have downloaded or not 4) Quotes System: There are some products which can't be given prices at all the time or are available only on demand so we want quote system. There should be two quote systems. (a) Instant quote (b) Processed Quote More details of this to the winner. Note:-- 1) Please provide your related cube-cart/e-commerce portfolio only. We don't want to see non-related sites. 2) Don't do copy paste messages as they are no -usefull to us. We will ignore them 3) We will be using a bug-tracing system for project development. 4) Also quote us for the after sales service. (Upgrades not to be included) Only the support and bug fixings.