as much as possible an amp that gives 65w RMS per channel. (so at least 65x2 RMS) you can get an amp that's a bit less powerful or a bit more powerful.
the drawback with the less powerful amp is you might not be making use of the full capabilities of the speakers, while with the more powerful amp, you run the risk of overpowering/damaging your speakers.
if the speakers are rated at 4ohms, should the amp wattage be rated also at 4ohms? if the amp is rated at 65w rms at 2ohms magiging half ba ang output since 4ohm ang speakers? or should the amp be 65w rms at 4ohms?
if the speakers are rated at 65w at 4 ohms, the amp should also be around 65w at 4 ohms. technically, if the amp is rater at 65w at 2 ohms, it'll only be 32.5w at 4 ohms.
in your case, your amp should be 65w at 4 ohms per channel.