What's up. I have a problem trying to select what would be the best amp to power a diamond audio m661 component set rated at 20-170 watts(rms).I've narrowed it down to 4 choices: the 300/2 JL audio 2ch. amp 4 329.99(150 w rms x2), the orion-6002 2 ch. 600 watt amp 4 289.99(2x150 at 4 ohms), the rockfordf. 551s 2 ch. 550 watt amp 4 289.99(140watts rmsx 2 at 4 ohms), and last the zapco reference ref350 2 ch. 350watt amp 4 379.99(2 x 100 watts at 4 ohms.What would be the best amp and why? All opinions appreciated. Thanks.