Chop ShopG 20

Three weapons I recommend and you can take him down fast or from afar depending on your play style.

1. sniper rifle from distance - on roof as you exit the safehouse
2. move in with assault rifle - $1k from pawn shop or in Fish'n Hunt store
3. up close with sword - from Fish'n Hunt (can carry 2 at a time)

All of these you can get right away and are fantastic for normal situations too.