My company specializes in user and customer acquisition for mobile and web based products.
Use Angel List and Startups.co to create a database. You might even be able to write a little web scraper script that automates everything and populates a spreadsheet for you. Then, activate Yesware on your email accounts, and use it to split-test the open rates with different subject lines. Once you have 2-3 subject lines that get high open rates, you can begin move on to split-testing the email content. Once you have a soft pitch that's getting a decent response rate, you can turn those initial "sales" calls into customer development interviews. By asking the right questions, you can figure out exactly which pain points you should be using in your positioning. Then, hit the accelerator. Direct email and phones calls aren't sexy. But they are a traction channel until you find something else that you can automate.
Let me know if you want to discuss further.
Austin L. Church