Best premium wordpress plugin for increasing CTR / ROI

So you've built up a bit of traffic? Now what do you do?

Obviously you keep link-building etc, but what about the website itself? What would be your next step? Split testing? Targeted ads? Black? Grey? White?

I've decided to try and extract more dollar from the traffic I already have and am looking for suggestions. Currently I use no ad manager and "smart affiliate links" to cloak links...but wanting something more robust.

What are your favorite premium plugins for improving Wordpress ROI (ie. squeezing more $ out of same traffic)? Also post free plugins if you feel they are of a "premium" nature!

So far this is the best looking one I've found; wp traffic tools - looks kick-ass with loads of features all in one & a few "black/grey" features I may consider trying out at a later date. Will be giving it a test drive this week but open to suggestions.

So reporting back after 2 days of testing and so far would def recommend wptraffictools (www.wptraffictools.com).

So far...

- transferred around 50 link profiles from smart affiliate links. I'm sure there was a faster way than doing it manually *goes off to learn phpmyadmin* That was what took me longest
- so far it has registered nearly 2000 human clicks which seem to tally up with my affilates

The main function I have been testing, other than the cloaking, is pop-up profiles. I have been using the "keyword in search referral" to target specific ads; using both "unblockable popups" and "unblockable popovers" (which require an onpage click to activate) - have also tried the jquery popover which looks lovely but is not closable.

My suggestion to the developer would be to provide stats for the popups (eg number of times displayed v number times clicked) within the plugin; would be good for testing.

Would also be good to have a closeable popover so users could continue to navigate (or some sort of iframe redirect similar to wp core conversion).

My current plan:
Weekend : create more targeted popover/under ads & setup
3 Oct Week : research ad profiles & setup targeted ads
7 Oct Weekend : think about using the redirection feature

With these improvements I expect to see significant increase in CTR with no change in traffic....beyond that I may look at the cookie delivery system however I'm not sure about this as little knowledge on the subject and am only really a grey-hatter...although I feel my site is thoroughly promoting the affiliates I guess I'd have to read their terms before considering it!

I get 10% CTR minimum on HTML sites.