You can find some very nice alternators in the $200 range, 160 amps would power that very nicely. 200 would be room to grow.
First things first. Hit the big 3. Big 3 is:
1. battery negative to chassis
2. battery positive to alternator
3. alternator negative (usually case) to chassis
In 4 guage wire or lower.
DO NOT PULL OUT ANY WIRES, JUST ADD NEW WIRES ON TOP OF STOCK ONES.
This will reduce the resistance between your charging system, the battery, and your equipment. Sometimes the change is hardly noticable, sometimes it´s very noticable. The big thing being, there WILL be an improvement. You can usually do this with around $30 in wire and terminals, and it´s proven to help reduce dimming lights and extend the life of your alternator, and maybe your battery.
I´m not going to remark on the capacitors. If they do it for ya, keep ´em. Hit the big 3 first off, if you get a new alternator, you´ll need it anyway.