mattrig,
well, a good HU will give u a good clean signal to start with. The tube pre-amp thign will give a tube-style sound whioch many people may not like. Go listen to home hi-fi and compare a tube anp with a normal amp.
I rpesonally liek tube amps with the warmth and tonality they produce. But this tube pre-amp is not that useful unless u like the tube soudn to maybe convert it to a tube-style music.
If they made it with a line driver and a crossover that willeb great but a fader control isnt useful and the sub control is not worth it for 1k.. for 1k, upgrade ur HU to a bette rone will probably give better results.