Advice on purchasing SEO Tools?

MAGIC SUBMITTER.

Sick Submitter - Submits to just about any site, but has it's own "sick language" that you must learn if you want to teach it to post on a specific site.

SENuke X - Submits to a pre-defined collection of sites. If they do not work, then you must wait until the developer fixes it.

MAGIC SUBMITTER - Submits to just about any site. You can add sites that you want it to submit to easily. If you can sign up for an account on a site, you can teach Magic Submitter to do it for you!

........BTW, you cannot purchase Tweet Attacks or Twitter Account Creator anymore. :\

great question bro. I recommend to:

scrapebox
sick submitter
the best spinner

they are all cheap but effective.

also here is some free tools:

ping.fm (easy to use social bookmarking tool)
article rewrite assistant (great and free article spinner)
blog bot (good web2.0 blogs account creator and poster)
traffic travis v4 free version (great seo/competitors analysis tool)
google scraper footprint finder (a simple scraper, some days I use it instead of scrapebox)