Alright.. here's my situation.. I have a choice of going with a JL stealth box witha 10W3V2 ina 3ohom configuration costing MSRP of ~$600
this sub can handle 300wRMS

or..

go with a removeable custom fiberglass box in the toolwell area with a 12W6V2 in a 2ohm config.
able to handle 400W rms..
come in at ~850...

My amp is a Audiobahn A4125HCT... 125X4 rms @ 4ohms 1 ohm stable and 2 ohm stable in bridged mode.
so at 2 ohms it will run 500w
and at 3ohms it will run around 375w

the price differenece is quite a bit considering if i pick up a used JL stealth box..