how many watts for 2 channel integrated/receiver for office using Infinity P152s

I've settled on the speakers, and I just am curious whether a 50 watt integrated amp, for example, will be enough or must I splurge for as much as 100 watts (the max recommended for the speaker). The room is quite small, about 12 x 10. I'm considering a new NAD or maybe something used, perhaps even vintage. These speakers are reasonably efficient--88dB. Any experience with the lower powered integrateds? I expect more watts is always a good thing, but I there's no point in paying for what I don't need, particularly considering this is an office set up. I have a good dealer nearby that will let me try things out, but I'd love to have some advice before I get started. Thanks in advance!

Awesome--76bB is plenty for me! That's exactly what I needed to know--