just found all the same stuff on amazon for $100 cheaper, so the total is around $630 including all the wiring kits and stuff. should I get nicer speakers? If I do get nicer speakers should I go for the Infinity Reference 8602cfx, the Rockford Fosgate Punch P1683 or the Alpine Sps-517's? or is there something better? Looks like the Alpines would give me the most RMS wattage for that Amp at 75w each. What do you think?!