You have the software you need but I'm not sure what type of survey you are doing. The Planner module is for a predictive survey while the Survey application is used to perform the actual survey. You don't really need netstumbler. Survey will give you all the information you need. The biggest step that is often skipped in a wireless design is determining design requirements before the survey. You can't design a network if you don't know what you are designing the network to do. There is a lot more to surveying than putting one AP up on a wall and walking around. You need to figure out what you are trying to do and then plan your survey around that information. Let me know if you need additional assistance.
