depends on the amp you want. the JL Audio 500/5 is a terrific amp for an all in one solution. the advantage to separate amps mainly is more control over power levels.
I've decided to kick out my Kenwood mono amp (Didnt I just bought that 2 weeks ago??) and now I'm planning to just go for 5 channels. Hence the questions.
As you know, I'm running two pair of Alpine Type R components and a LA sub at 300watt rms.