Tier 1 properties: What should I use and where do I buy it?

I have a lot of solid Web 2.0 properties pointing to my site but I think I need some top quality Tier 1 properties to move me in the SERPs.
What are you guys using?

I bought some guest posts on Fiverr, about 6 of them to start with.
What else do I need?

Do I just keep buying guest posts? I think there are enough gigs for me to get guest posts on about 15-20 different domains. Or what other Tier 1 properties should I look for? I would like to get some diversity in my Tier 1 stuff.

What…

Tier 1 properties: What should I use and where do I buy it?