Online Wholesale Store

Need a online wholesahe store I have three level of customers from different part of world I need visitors come to my site can only see profile, member's login, Membership Request & Contact Us. Members after enter UserID & Pass will enter in Store and can see product range only, and the prices of his level (Group A's can get price $5 & Grourp B will get $7 for same product) these difference of price I will adjust in Control panal for each product. Second Thing : I need to show Thumbnils in Columns (3 -4) in my store, I want to show Thumbnil, Article No, & Price. On Click on any Thumbnil, complete details of products will be displayed, but About Quantity I need to show for each size and Color (like Jacket 123 have 6 sizes & available in 3 colors, I need to show available quantity for each ) and same way visor can order Qty of each size & color on same page.