My company is currently seeking new avenues of marketing. Our ROI on SEO is not what we'd anticipated, and cold-calling is not working as well as we'd like.

We are willing to spend money, but we aren't sure which avenue will produce the highest yield.

Here's what we've been investigating:

1. SEO Marketing
2. Email blasts
3. Drip marketing
4. Mojodialer/Cold Calling
5. Direct Mail
6. Voice Broadcasting
7. "Turn & Burn" landing pages/websites

Does anyone have any thoughts on these?