Buy in amount

[krammatrix]

I'm going to play in a 1-2 nl game tommorow and I only have $200 on me right now (thats not my whole bankroll I just don't have access to the rest right now). The game I'm going to play is very fishy. I was talking to a friend of mine, and I told him I was going to buy in once for 200, but he told me to buy in for 100 at first, so I could keep playing if i get a bad beat. What do you all think is the most profitable in a fishy game with only 200 dollars?