which alt? please help

[hellbender 10+ year member]

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I have a 1993 s10 blazer w/4.3l vortec and I just got a directed 1100d and a PG xenon 200.2 amp. My lights dim already at idle with a 100 amp stock alternator and my jbl px 300.4 with a 78 amp draw. Out goes the jbl and in goes the PG and the directed, so how big an alt do i need? could i get away with a 160 amp alt or would i need bigger like a 200? thanks guys,

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[iceteebone 5,000+ posts]

have you done the big 3 yet? if not do that first. make sure you have good grounds and proper wire size.