As a general rule, if the manufacturer is well known and the specification is high the price will follow. Also, generally, you get more for your money with AMD processors than Intel because they are cheaper.
If it is any help, my daughter bought a Fujitsu-Siemens Amilo Pa 1510 from John Lewis at Christmas. The spec for this laptop is quite good click here and the price was £599 with a 2 year warranty. I`m not certain if it is still available but the group does provide a good range at competitive prices, this is also true of many other suppliers.
You could browse click here for prices and click here for reviews. But at the end of the day it is what you want to use the laptop for and whether it suits your needs that counts.