Houseplants for oxygen regeneration?

[Big Limpin']

Hey guys,
Well, winter is upon us, and that means i cant really keep my windows open without running up a big heating bill (im not in the arctic, but its dropped below freezing last few nights). Now, it may be my imagination, but i feel like the air in my apartment is getting depleted of oxygen. I have no plants right now, but am considering buying a bunch of them to help produce nice air for me to consume.

What kind of plants are the best for this? My guess is that the quicker a plant is growing, the more CO2 it is consuming, but im no botanist, so i really dont know. AM i looking for any specific kind of plant? Also, I doubt any individual plants could do much by themselves, so i'll probably be needing quite a few? Would, say, 3 or 4 be enough to make a noticable difference?

I know that 95% of you must be as clueless as me on this, but hopefully somebody has good insight. Please share!
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