Ok... here are some answers...
About the prices: The price that will show in the checkout is the one you will pay. Depending on if you use paypal or credit card it will specify the price in different ways, but it's still the same price. Also, please read the shops FAQ for answers about V.A.T. (value added tax)
About the payment: After you've done the payment via credit card you will get to a page that says if the transaction has been accepted or denied. You can also print out a pdf of your order. From here you can not get back to the shop. No linky yet. We're working on it. However, yes, we've got your order.
After you've done the payment via paypal you will be told by them if the purchase has gone through.
Upgrade! You can now purchase using Verified by Visa and Mastercard SecureCode.
About the shopping cart: The shopping cart does not always empty itself after a buy. This is really annoying, but we'll have to live with it for now. I think there's a bit of trouble with the shopping cart history too... but it's nothing that will affect your order.
About the shipping: Ok guys, we'll try our hardest to get the stuff to you as fast as we can. However, in the beginning there will be a lot of orders to take care of so you will have to practise some patience.

Don't worry.. you WILL get your stuff!