I have about a $600 rough estimate of what I want to spend on subs alone and was wondering what you guys would recommend. I'm looking to the Rockford T1's but not sure whether to get the D2 or D4's? What's the real dif there anyways? E-bay included. I'm just looking for something that will impress most everybody but will last a good long time as I don't have the money to replace any of this stuff. RELIABILITY tops my list, followed for a 2nd place tie with pound and quality sound. Everyone says Rockford's last (though quality is debateble but most seem to agree the power series is good) I listen to everything ranging from beethoven to Linkin park with middle stuff prolly being the most listened to, country and pop (I don't wanna hear no comments about my musical tastes! lol). Any help in getting the best quality bang for my buck would be MUCH appreciated