OK, if that's a bit much for ya, there is one other option...
Don't wire the deck into the fuse panel (or the factory stereo power wiring). Run a wire directly from the battery, with a circuit breaker or fuse located at the battery for protection. The wire should be at least 8 guage to handle the current needs of the deck.
This should provide enough power for just a deck.
BTW - The 1 farad capacitor that I linked to above stores energy and then releases it to the deck/amplifier when it needs it, like during the bass beats.