question about these 2 amps

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I was just wondering outta these 2 amps which would be better? I have a set of focal polyglass components I'm powering in the front and a set of speakers in the back that i want to power at 50 watts rms each. Both of these amps give that so I'm just wondering which would give best sound quality price doesn't matter as i can get both for around the same price on another site. Or maybe even some other amp suggestions?

http://www.crutchfield.com/p_114D30....html?search=Diamond+Audio+VENDORID114&tp=115

http://www.crutchfield.com/p_500MRPF300/Alpine-MRP-F300.html?search=Alpine+VENDORID500&tp=115

Also i'm looking for a good amp to power my alpine type r 4 ohm 12 inch sub 600 watts rms. I have one now that doesn't give it enough power.
 
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