In the past, I knew that Google allows us to place maximum 3 text/image ad units and only 1 link units on a page. But currently, I can put maximum 3 text/image ad units and 3 link units on a page. It looks like Google have changed their policies about number of link unit?
Why are you guys just guessing and not actually taking a couple of minutes to read what the rules say. It's not difficult, and it will save you a lot of headaches. Here is what you want: https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=9735
I would save you more than a headache. It might save your account all together. I always read tos for Adsense when I have a question. Anything else is just risky.
3 Text / Image with 2 Links ads, and more over better to place less ads in the site.. just my suggestion