On the front a couple of flashing Cateye EL135s are good.
http://www.evanscycles.com/products/cateye/el135-3-led-front-light-ec007943
They will generally be flashing out of synch, which is very visible, and you can turn each light so it is pointing slightly outward, increasing the angle of visibility from the front.
If one of mine fails, so I only have one flashing light, I will find cars will start to pull out on me, whereas they won’t when both are functional.
For the back a vertically mounted fibreflare is good for side visibility:
http://www.evanscycles.com/products/fibreflare/rear-light-ec021737?query=fibreflare
otherwise the cateye TD1100 is a standard as it has side visibility, and if you have it on flash you can have the two horizontal rows althernate, so constantly visible:
http://www.evanscycles.com/products/cateye/tl-ld1100-10-led-rear-light-ec007955