Best alternator amp for my setup,And one wire or not?

Ok what I need to know is whats a decent amped alt I should run for my setup. And should I do one wire or not.
My current electrical setup..
383
Aftermarket universal 24 circuit harness
Electric water pump
Electric fuel pump
16" push fan
2 smaller pull fans
6 autometer gauges
MAYBE a radio if I could keep it hidden
Regular electrical such as headlights, tail lights, brake lights..

Also what's better one wire or not, what's easier..
Thanks.