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.