Silicone is fantastic, but I would recommend trying to stay cheap until you know what you like so I voted plastic.

one word: SILICONE!

I like plastic and silicone. plastic traslates the vibration realy well and it's smooth. Silicone comes in different textures and varying drag which can feel great or not, but it usually is my first pick.

S is for Sexy!
I is for Intimate!
L is for Lovely!
I is for Incredible!
C is for Cool!
O is for Orgasmic!
N is for Nice!
E is for Erotic!

Silicone