@dunkin The most important thing is that the amp have good clean reproduction at a low power level like 1 Watt because even with your speakers that will be a common power level.
The class of operation, the amount of power isn't important as long as the amp is musical and plays nice with your speakers. As a general rule of thumb its not a bad idea to have a bit more power than the speaker needs so you'll always have headroom. So if the speaker's max is 70 Watts a 100 Watt amp is a good power level.