Kobee, the usual amplification principles would apply to your situation. You start with the anechoic rating(not the in room)of 88dB for 1 watt at a 1 meter listening distance. Then, in a typical home listening room, the sound level drops off at about 3dB for each doubling of distance beyond 1 meter. In your relatively small room you apparently would be listening at no more than 8-9', which would result in about an 84dB level for 1 watt. 5 watts would allow for a level about 7dB higher, i.e., 91dB. This would be the level per speaker, and with both speakers playing, the level would be 3dB higher, i.e., 94dB.
This is quite loud, although it's about 10dB below the level on brief peaks that highly dynamic(e.g. some classical recordings)music would require when played at a rather loud average in the mid-80s of dB. If you listen at a lower average level or to material with a lesser dynamic range, your amp should be satisfactory.
