get a viper 2500.1...that puts out 25 @ 2...that should be decent for 4 10's that need 3k rms? idk just a thought, those go for like 300ish refurbed on ikesound
Don't waste your money on an collosses unless you are competeing and have the electrical to back it up. Stick with the other ones mentioned orion 2500d at .5 ohm, viper 2500d or kicker 2500.1 I say which evers cheaper but most like the orion or kicker will give out the most power and the viper will be the cheapest one.