How much does edition matter in textbooks?

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Hi, guys. I'm in the market for a reference nursing textbook. I heard some good things about Brunner. For the current edition (10th 2003) I'll have to shell out about $100 but for last edition (9th 1999) I only need about $30. Do you think it really matter which edition I buy? Could I get away with buying the edition that's not the most current or would content difference justify the price gap? Any advice on a well written reference nursing textbook would be greatly appreciated. Thanks.

Here are the list of books I have to get for class:

Davis Drug Guide for Nurses, 11th

Fundamental Success: Course Review, 2nd (Nugent)

Taber Cyclopedic Medical Dictionary, (indexed), 22nd

Davis Comp. Handbook of Lab and Diagnostic Tests, 3rd

Pharmacology: A nursing process approach, 6th (Kee)

Taylor Fundamentals of Nursing

Weber Nruses Handbook of Health Assessment

Taylor's Video guide to clinical skills

Nursing Care Plans and Documentation (Lippincott publisher)

Calculate with Confidence, 4th ed. (Gray Morris)

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