Nag Champa is the best incense ever.
You can find it in its characteristic blue box in a variety of places, from smoke shops to exotic import stores to head shops to liquor stores. The price is alway very reasonable -- no more than a few dollars per box, which should last you quite a while.
Nag Champa has a really nice, sweet, herbal scent that will eliminate any unwanted odors that might be lingering around your house. I prefer to burn Nag Champa in another room because sometimes the smell of the smoke can be overpowering.
The best part about Nag Champa is how all your friends will complement you on the way your house smells.
You might be accused of being a hippy, but it's worth it!