Wireless Mouse/KB for Gaming?

[weyland yutani]

I'm looking for a wireless mouse and keyboard for general use and gaming, budget is tight at around £50 max.

I dont know anything about these, Is there inherent input lag that makes wireless a poor choice for gaming? Do they use bluetooth or wifi and can they interfere with wireless internet?

I'd appreciate your recommendations.

 

[weyland yutani]

Well it seems a wireless KB/Mouse for gaming is out of my budget.

Any thoughts on this wired gaming mouse?

http://www.overclockers.co.uk/showproduct.php?prodid=BU-001-RA&tool=3

and this wired KB?

http://www.overclockers.co.uk/showproduct.php?prodid=KB-140-MS&groupid=702&catid=23&subcat=1258

Stupid question but would using a USB extention lead on these causeany latency issues at all?

Thanks