Our budget is $15000 (not including the honeymoon) for 80 guests.
The biggest part of your budget is the reception and is the part we found the most necessary to keep costs down as your price per head is times out by 80/90 guests. Our reception cost is $90 a head and includes decorations, MC, DJ, 2 courses and wedding cake for dessert, drinks package etc.
I agree with Rhett's girl - you have to sit down and decide whats important and whats not. We decided that our reception, photography and our honeymoon where important (and well my dress). There are heaps of things you can do cheaply or DIY that will save your dollars - for example we are using wedding cars from local car clubs that FH is associated.