I dont want to go crazy with the system in the M3 i will be getting. I plan on going with the HK stereo and adding an amp and a sub/subs. what do you guys think about this route? i dont want to spend a ton of $ but i want to get some decent bass and have the atereo sound good when it is turned up. If there is a better route i should be going, tell me. Also, which amp and sub set up will get me the best sound? should i be going with one or two subs? and finally, can the amp and subs be hooked up to run with the stock hk system?