Broad Keyword Research needed for various topics

In need of keyword research done for 12 broad topics. I need as many keywords gathered that are broad, have a decent amount of traffic daily/monthly AND are not next to impossible to rank for in the search engines. Keywords example: Topic = Health Good keywords would include: Health articles, health magazine, healthy living tips Bad keywords: Quit smoking ebook, Weight loss nutrition Both of the above keywords cater to something very specific, which would not fit into a general health site that would carry information revolving around numerous health topics. Basically any keyword that could be used for any site that revolves around any health topic in general is the idea here. Topics given upon request or upon coder selection. Completion required within 7 days.