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I don't know why you want overstable driver, but since you asked: Firebird or Predator. Both are great overstable drivers. Throwing backhand I had to develop a lot of snap before I was capable of throwing either correctly. But, I know a lot of players start throwing forehand with overstable plastic. Not saying that's the best idea (mostly because my forehand is terrible) but I have seen a lot of forehand throwers that can crank these two discs out there.
I would suggest a mamba. Very easy disc to throw for a beginner or someone with not a lot of throwing power.
I had 3 Champion Mamba's in my bag till they started Really breaking in..... They Will become a rollers, BUT, out of the Box, those things fly FOREVER!!!!!
skeeter or a Flying Squirrel
WHIPPET or monster it will be like throwing knives FUN