Magento template install custom and many extensions / custom

We need this template installing: [login to view URL] and will need some design / layout changes to it. nothing major Can you confirm magneto can do all the following as standard ? Or if not show me the extension you would use: manual credit card processing, 2CO checkout integration worldpay checkout integration 1 page checkout TAX / VAT support shipping calculator in cart by weight and destination currency selections product option with colours for each option / item I also need these installing: - stock / inventory management - [login to view URL] - We need unlimited users / sites. is currently limited to 5 - ebay - integration for each of our sites. We need separate instal of this for EACH of our sites - [login to view URL] - amazon products - need an extension the same as the ebay one above, but one that works for amazon - what do you suggest ? - stock indicator - [login to view URL] - help desk for all sites etc - [login to view URL] - dpd - [login to view URL] - royal mail - [login to view URL] - google product feed for each individual site - [login to view URL] Please let me know situation ASAP and prices and how long to complete. Please note it is very important to know that ALL of our sites / and extensions must work with an unlimited number of sites, and each site we must be able to set all settings / stock things separately. However, we hope we can have 1 backend for all orders management of all sites, all stock management of all sites etc. where is the MASTER site installed. i.e.: if i have 20 sites, where is all this data stored ? as all my 20 sites are on different servers etc, not the same. Maybe you can suggest better things for all needed above ?