Made ultimate noob mistake by assuming my new motherboard had built in wifi... it doesnt 
Need a NIC, I want to be fast, very fast, and have the best signal reception as there are a few thick walls between my router (Home Hub 4 sadly...) and I.
There is a shiny ASUS one, £65... ouch! What's the difference between this one and a lower end one?
Any recommended ones? Or is it a case of buy a cheap one, there all about the same.

Need a NIC, I want to be fast, very fast, and have the best signal reception as there are a few thick walls between my router (Home Hub 4 sadly...) and I.
There is a shiny ASUS one, £65... ouch! What's the difference between this one and a lower end one?
Any recommended ones? Or is it a case of buy a cheap one, there all about the same.