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What would be the best amplifier for these speakers?

Hi guys, a few time ago I needed a set of speakers for my PC so I brought back to the light two speakers from my old Philips Hi-Fi ( http://imageshack.us/photo/my-images/216/28505497yt5.jpg/ )
and a set of 2 broken PC speakers that I didn't throw away when was time to... So, long story short, I used the PC speakers circuitry to supply my Hi-Fi speakers and plug them to my PC.
Now I was thinking if there is any way to give a better supply to these speakers in order to get a better sound.

Speakers: FB 545 PH
Impedance: 6 ohm
Watt: 100

Thanks  :)