For any survey tool, you need a way to load floor plans, a way to collect different SNRs, and have those combined, interpolated, and represeted in a graphical way (ala Heatmaps), and needs to be easy to setup and run. An IAP with Spectrum gives you decent point-survey tools, but does nothing for floor plans and visualization.
If you are using a mac, I cannot recomment highly enough Netspot (http://www.netspotapp.com/). it's $150 for the pro, is SUPER easy, makes good graphs, etc. So long as you don't need the tools and capabilities of Fluke/AirMagnet, this is a perfect tool IMHO and I use it often.