With that small amount of power you should definitely go with a big box for them to make the best of it.
Power rating is very misunderstood by most people. The manufacturer gives it a rating based on long term thermal reliability. In most cases you can run significantly more to any speaker for short periods at a time (music is dynamic) without damage.
i got a box ya'll, thanks for the help. I just put in a box i had made for another sub, and it wangs, but sooner or later i'm going to have to build a box for my ***. Look out for me when i do and i need some help. Thanks again.