If you're just looking for rank tracking, there's a few I've heard good things about (obviously, I like Moz, but I use a lot of the other features too, and am biased):
Our rank tracker also has a competition analysis tool attached--so you can get data like # of backlinks, etc. for the top 10 Google results for any given keyword.
I currently use the $100 plan on Authority Labs and their delayed reporting is incredibly frustrating. When it works it great to get detailed and exact ranking stats on keywords. When I can't get reports and keyword data is delayed 1+ days, it sucks.
http://whooshtraffic.com/rank-tracker/
Our rank tracker also has a competition analysis tool attached--so you can get data like # of backlinks, etc. for the top 10 Google results for any given keyword.