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that all depends on the sub(s) you plan to use... what do you have in mind? I have a pair of cheap MTX 6000's(250rms) underpowered on an interfire amp(450rms) and they hit pretty hard for a cheap pair of 12's in a downfiring box built to spec air space.
I have been around my share of audio equipment, I had a 13.5" JL w7 and had 15" L7's in my ext cab and have made garage doors rattle from the street! :E I miss my kicker subs!!!
Next I plan to run a pair of JL 12w3v2's in a fiberglass box built to spec air space sealed for looks and Sq/Loudness... off the same Interfire amp