Auto Acoustics grilles Nice. Upto 30 for a 12" one, though they have a 12" yellow one for 7.95 at mo!!
I have a full rockford install and it sounds ace....much beter than my X-plop ones i had before...dunno how people can even compare them?
My gf has a Sony sub in her car running off a sony amp, and TBH for what she uses it for its fine. It doesn;t come near the quality of my infinity, btu for the price you just don't expect it too.