Recommend a minimum of 150 watts rms per channel and not a mono amp for these speakers. Always better to have a little too much and keep the gain down to prevent clipping and your amp from working as hard than matching watts and cracking it up as much as possible. Also I don't recommend ever shopping for an amp and using peak watts as a determining factor. RMS is what counts.
For example this would be a good starting point to consider. Rockford Fosgate R150X2 2-channel amp.
Rockford Fosgate - Prime Car Amplifier - 150 W RMS - 2 Channel - Class AB - Multi