Mike is right , a torque wrench is an expensive item that'll rarely get used . Use the money to purchase items you can/will use more regularly, after you gain years of experience working on bicycles you will get to "feel" how tight something needs to be !. I can see the need for one if working on cars esp, with engine tolerances .. but a bicycle , nah...
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Velosophy#1: It is better to have a bicycle and no money , than money and no bicycle ! Velosophy # 2 : "Winning is simple, but not easy." #3: "Give a man a fish and he shall eat for a day , teach him how to fish and he will sit in a boat and drink beer all day"