The Marketing Budget Allocator

Help me allocate my marketing budget for the best return.

Total budget: [AMOUNT]
Goals: [DESCRIBE, WITH PRIORITIES]
Channels available and any past performance data: [DESCRIBE]
Sales cycle and customer economics: [DESCRIBE]

Provide:
1. A recommended allocation across channels with the reasoning
2. The balance between proven channels and testing new ones
3. The split between demand generation (long-term) and demand capture
   (short-term)
4. What to cut if the budget were 20% smaller, and add if 20% larger
5. The metrics to reallocate on

Base it on economics and payback, not channel fashion. Note where I need
real performance data to decide well.