I'm planning out the system that I'm going to be adding to my wagon... I'm looking at the Alpine 9813 that has 27W RMS right out of it. I'm planning on using Boston Acoustics Rally RC620 speakers...I'm just wondering if I should get a different HU and add in an amp to power these speakers. I know its common practice to use an amp w/ good speakers such as these...but would 27W do it adequately? Thx much....I'd definitely rather avoid doing all the extra wiring if possible, but I'm planning on doing Brown Bread and all that stuff anyway...it'll probably be a while before I get all this done, but I'll try and post some pictures of the install once I get around to it.