which sub for a 99 silverado ext. cab

[bigtbuck]

hey, i just got a 99 chevy silverado ext. cab and i was trying to figure out which 10 or 12 inch sub to buy. i'm looking for something with 300-500 rms. i want it to be loud but have more sq than spl. right now all i have are 2 8 inch. mtx subs and they dont cut it. i'm going to be building my own box for this too so if anyone has pictures of their boxes please share them.

[mgaidica]

i can personally recomend the Elemental Design's K.You could send it 600 watts and youll be SET.