The superflash is a great taillight for the money. I own 3, but we haven't had any rain here since I got back into riding in March of this year. There are many threads about the superflash; you should be able to find alot of information using the search function.
The headlight doesn't look like it would be too good for helping you see the road and any obstacles in your path at night; more of a "be seen" light. What kind of street lighting/conditions/speeds are you looking at? Do you need a light to see the road in a rural area with no street lights, or just something to keep you legal and help increase your visibility to other road users?