I'm not sure about conversions for US Dollar, but I'll give it a try in case you're not good at converting monetary units. Other currency, click on the "Monetary Conversions" link in my thread to access a great site to do your monetary conversions. I have rounded all values to the nearest hundreth, and assuming the pounds in question are British pounds. So here goes:
£40.00 = $73.13 USD
£100.00 = $ 182.83 USD
£500.00 = $914.15 USD
£1,000 = $1,824.30 USD
I don't normally do this, but here are Canadian dollar currencies for our Canadian folks (like my buddy Kart Racer)
£40.00 = $97.41 CAD
£100.00 = $243.53 CAD
£500.00 = $1,217.65 CAD
£1,000 = $2.345.30 CAD
More on what I think about the price in a future post. And set me straight if I got any information wrong.