Hands down, my favorite resource for researching issues without a clear cut answer in the FAR is the WIFCON Protest Decisions by FAR Part page.
It provides summaries of Protest Decisions by FAR Part so you can quickly scan for similar issues to the one you are researching. It allows you to quickly identify the key questions you should ask when assessing the risk of different courses of action.
It also helps identify common scenarios when the Government wins and when it loses for each issue or situation.
For example, at 87 CONS we issued our first Commercial Solutions Opening (CSO). What are the risks? A good starting point would be decisions related to Broad Agency Announcements (BAAs), http://www.wifcon.com/pd35_016.htm, since the procedures are similar.
Next time you’re having a debate with a co-worker, bring a quote from a decision (or two) to enhance your argument.