Great ideas are a dime a dozen.
So are good coders.
What counts is action. If you are low on resources, it is unrealistic to expect someone else to work harder on this than you are willing to (directing a coder partner to build it your way would fall into that general category)
Your options? I only see one that is realistic. Save some money or get an investor, and put some skin in the game. Reserve the luxury of hiring/firing coders (with a low budget, you are likely to burn through a few of them before settling on one that can deliver).
Statistically speaking, the chance you will succeed is pretty low. If your idea is spectacular, get some other people to believe in it (and you) and spread the financial risk between them.