I work in the IT industry, so i'll chime in with my 2 cents.
 
Personally, if it were features you were after then I would look towards Acer, yes their customer service might be a bag of s**te but the product is good.  For £800 you'd get a cracking laptop.  A good spec, and feature rich.
 
For reliability, then have a look at the Toshiba laptops.  They have a moneyback guarantee that covers you for the life of the laptop.  If you laptop dies / breaks not only will they repair it for free, under the warranty agreement but they'll give you your money back (ex-VAT) - Cant say fairer than that.  Talk about confidence in your product.
 
Also, they have a cashback offer as well as a cashback offer for accessories purchased with them.  I will have to double check whether that is just a business offer or open to consumers too.
 
Sony / HP / IBM are fine, and are good solid laptops, but, your paying for a badge.  So if you've got cash to burn then buy one of those.  IMHO, not worth the money.
 
Dell is the devils work, avoid at all costs.  Complete crap.
 
Ultimately though, buying a laptop is like buying a car.  Its very subjective, what exactly do you want to do with it, and whats the budget? 
 
I'm i'll find a deal for you 
