I have 2 10 inch JL w0 subs that push about 125 watts each. I also have a 4 channel 300 watt amp made by JL. What would be the best thing for me to do: use this amp for the 2 subs or buy another amp for the subs and keep this amp for my speakers? Also if I buy another amp for my subs should I buy a 2 channel or mono? What brand kenwood, rockford, or alpine?