If you want a future one then you going to spend much more as other members suggested ( i know may makes you think for a future one, as they are better) ... but i will recommend a priced one, in the range you have suggested,
in the case if you really
Can Not spend more than £50
The one below mate is getting 105mb with it and is 450mbps wireless and i think the BEST in this price range for wireless and wired and i believe you can not go wrong with it, for that money (seems is on offer around £20 less)
http://www.amazon.co.uk/TL-WR2543ND-...3057891&sr=8-4
Can use and 3rd part firmware when you get more familiar with the the unit
EDIT
I don't owning the amazon shop