ECommerce Website for Virtual Goods Gaming Industry

Warning: I will only pay for finished, working as specified shop (or per function after initial launch). Your code is going to be audited so don't promise me quality and then deliver inefficient code. That should scare very incompetent programmers away, everybody else read on! Requirements: - experience with creating and maintaining/upgrading similar projects - elegant problem solving, there will be a lot of custom functions and you should be able to find the easiest way of implementing them - must be lightweight (fast) and I want to retain ability to replace you in the future (other person must be able to pick up where you left off) PRIORITIES: Ease of use > Speed > Functionality > Appearance (minimalistic graphic) I need somebody with imagination and experience with e-commerce (and more importantly, legit SEO) to advise me or change (improve) my ideas. I want simple, intuitive solutions and the highest security within my budget (high price:value). I don't have time to discuss every single detail, I want you to be able make efficient decisions on your own (as if it was your own store). Although I put a lot of thought into this and have 25 pages long specification, I will (count on it) change, improve and add things constantly. I will add and maintain a great content and this site should generate some serious traffic, so I want a long term cooperation for years to come. Lets build a shop which we will both be proud of :) I'm online 100h a week so time zone difference isn't a problem. Duplicate (thin) content problem to solve: - each game has many game modes (servers) and prices may vary for the same item - extra options (variations) of the same item, different prices for each variation and based on quantity ordered (up to 10 extra choices for each item and each item has own, unique options) STAGE 1 (bare bones) Basic shop made with newest SEO standards and typical functions clients expect so I can start selling asap (most real world functions are totally useless) a) Basic Info - 3 games, 500 items, added products must be easily exported later, if I decide to change platform - English (maybe Polish and more languages later) - Currency € and $ (maybe PLN) - Payment methods: PayPal (maybe Polish online banking/Skrill/CC) b) Customer service online for xx more hours (daily schedule and need an ability to start/end early) c) Customer needs to choose server (game mode) before purchase (easily changeable and remembered by cookie) Desired but can wait: d) Quite advanced product page with a lot of extra options (different for every game or even item) e) Accounting to match Polish (European) law requirements and VAT f) Level calculator (displays price and time for custom jobs) g) KB/FAQ/Guide etc. tabs (maybe "?" icons which will display text when you hover over) h) Category guide/description on top, ability to "view more" STAGE 2 (adding features 1 by 1 for the next few years) i) Loyal customer status bar and perks (higher level after spending more money) j) ForgeCredits awarded or purchasable k) Custom sorting filters (e.g. popularity determined by me) l) Search with detecting what customer means, including misspelling m) Checkout delivery options and required information based on added products n) Custom checkout made for client's request (I add products for him and just give the link) o) Backstage panel with filtered order list (each employee will have access to specific orders) u) Order integration with market places (PayPal payments or e-mails) p) Digital delivery r) Marketplace s) Promotions, coupons, related products, item bundles Please provide: 1) Links to shops you made, ability to talk to your former clients would be great (and I can do this for your future clients). 2) What general solution do you recommend based on this limited information and why. 3) Briefly, how would you solve presented duplication problem. 4) Estimated price and time in days and hours for whatever you are offering to do.