Extend my Wireless Network?

[AMDPower]

Hi all

I am looking to extend my wireless network, currently my netgear Dg834g
does not have enough wireless range to deliver any signal to the ground floor, the model is upstairs with me.
My brother wants to connect his PS3 in the living room and laptop sometimes so it need to be able to deal with that at least.

I was wondering what is the best way to extend this? I am looking at wireless extenders and access points. Just not sure whether to get an range extender or Wireless access point, specifically

http://www.overclockers.co.uk/showproduct.php?prodid=NW-030-TP
or
http://www.overclockers.co.uk/showproduct.php?prodid=NW-067-TP&groupid=46&catid=1837

I have also seen these powerline adapters, from general reading they seem to be more reliable but more expensive? Is this correct?

for about the same price I saw this on offer

http://www.overclockers.co.uk/showproduct.php?prodid=NW-093-TP&groupid=46&catid=1604

any good?

would appreciate any advice or product recommendations.

thanks