Cheryl,
If you want to expand input from a Citizen Advisory Board to your citizens across the community, then consider posting an online public comment forum -- such as OpenTownHall.com. This type of online forum is civil, legal, insightful, easy to set-up, and inexpensive (in terms of dollars and staff time).
Mike

Cheryl, we used a short-term task force approach...i.e. a six month Budget Task Force (5-7 members) to review departmental submittals to reduce expenses 20 to 25% annually. We started with a general budget overview of process, and five year projections, then the depts presented their ideas for reductions, and the citizen group prioritized for us. The group included local business folks, as well as former critics of the Citys' budget. When faced with best practices information w/comparsions to other cities and hard cold fiscal reality, they did an excellent job in report to City Commission. For example, we reduced fire svcs personnel by 25% (w/o push back from community or union, as the recommendations were endorsed by the citizens task force.)

Hi Cheryl, as I just posted on a similar question, we've been building a directory of tools cities can use to engage with their citizens here: http://civiccommons.org/engagement-commons

Here's a case study of how the Calgary government solicited input from its residents on the 2012 budget that might be useful: http://civiccommons.org/stories/budget-consultation-calgary

It lists several tools (some specifically for budget feedback) that you could repurpose in your city.

Let me know if I can answer any questions for you.