depends on what you wanna spend.
and you best steer clear of combos. they rarely offer value.
logitech do some good basics. the sidewinder x4 is probably the best dome keyboard on the market with its 20key roll over.
the logitech g400 mouse is probably the best cheap mouse you can get.
if you want higher end then a falco,das,Q-pad, corsair, tt sports, mechanical keyboards with cherry browns (tactile but not clicky) as all offer at least 1 keyboard with full Nk roll over on Ps/2 and or USB.
for the mouse zowie am or ec2 for functionality without fuss. or if you want all bling bling look for a gaming mouse with an optical sensor like the razer death adder.
although i do like the looks and stats of the new logitech G502.