At the other end of the price scale, I've actually been really impressed with this cheapie Bell taillight -- outperforms much more expensive bike-shop lights, and you can afford to get several of them. Get some rechargeable AAAs and you're in business.

When I did my LCI training course, we compared the night-riding setups of about 20 serious bike geeks, and we found that, above a certain minimum point, the brightness of the lights themselves is less important than their location. The higher on your body you put the lights, the more visible you'll be. I typically use two of those Bell taillights -- one on my bike's rear rack, and one on my helmet, one steady and one blinky. I use a fairly cheap headlight, and I keep it on flash - but I will say that I spent the summer in Boston and up there I did want more. You might like two headlights, one steady and one flashing. I also use a high-vis yellow reflective vest -- the flimsy kind you can get for $7 at Walmart is great, because you can roll it up and stick it in your pocket. And, as others say, put reflective tape all over, particularly on moving parts like cranks and pedals. Ride safe!