Which tennis racquet should i buy ?

I just started playing tennis a half year ago with some old used racquet. And now i'm thinking of buying a new, but i don't know where to start looking. What i need is a good beginner raqcuet that i can use for a long time since i'm not planning on playing this sport seriously. I'm a petite 18 year old girl, so i don't think it should be at to heavy racquet. i'm whiling to pay from 70 to 100 dollars. I don't know if thats to much or to little but i looked in some magazines and that was what some of the cheap racquets cost. (i live in Denmark so the prices are always a bit higher so please take that in to consideration ;) )