As you already use QTP your best bet will be Quality Center. This does not meet you requirement of cheap or free.
I do believe that Mercury licensing has recently changed - not sure of the specifics but you might want to talk to your support or sales rep to see if Quality Center is now included and if it is you could get for free.
Check out IBM's Manual Tester. It also does not meet the cheap free criteria but this is an excellent manual testing tool. It also integrates with the IBM CQTM which sounds like a bit more than what you're looking for. The IBM manual tester is very good for manual test management.
ClearQuest Test Manager (CQTM) from Rational is a good solution for Test Management.
Ring-zero makes an integration between CQTM and QTP, and it helps you to avoid the high costs of Quality Center / Test Director. See the following URL.. there is a flash video link which also can show you what CQTM looks like, in addition to the integration between CQTM and QTP.