can you recommend the best vs affordability ?
I imagine there will be a lot of opinions on this so I will try to be impartial:
Anything in the top right hand quadrant will be good I use McAfee total protection 2014 at present, £30 for 3 machines.
http://www.ebuyer.co...zUibPbRIrnw_wcB
You can get some for free and some which aren't as resource intensive but I believe the CPU/RAM is used up for a reason. So is therefore a good trade off for protection.