A couple of lessons from someone who can chuck it a long way would probably get the distance with the kit you already have...
I could just about manage 100mts... an hour with Terry Edmonds and I was hitting 140mts (admittedly with his rods 12' 3.5lbs casting 2.5 - 3oz weights) with a spod/spomb rod and a loaded spod/spomb you should hit the mark, it just needs someone to show you how