I have a website which earns me about $0.60 per visitor. The site traffic is currently about 100 per day but I want to ramp that up considerably.

There seems to be so many different options out there nowadays that I don't know where to start.

Currently, my traffic comes from:

1. Looksmart express submission

2. Yahoo Biz Express submission

3. Goto & epilot pay per click

4. Referrals from a banner on one of my other websites

5. Forums posts (using a signature tagline)

Bearing in mind what each visitor is worth to me, what recommendations can you give of buying more traffic? I don't want to spend more than $0.60 per visitor as I would make a loss.

Any ideas? Any scalable solutions?