RF measuring devices

Hi Folks,

In an attempt to do the (nearly) impossible and have the best of all worlds, i.e. get a  cheap, highly sensitive, and wide frequency range RF measurement device, I've been running around the internet  Here are a few options I came across.  Does anyone have any experience with them?

First is the poor mans spectrum analyzer, a do it yourself kit that reads from 2 to 2,150 MHZ.  This would require help from a local electronics engineer to assemble since I don't have this level of knowledge.

http://www.science-workshop.com/

Then for the lower range of up to 200 KHZ I came across this PC XY USB oscilliscope.

http://www.hobbylab.us/default.aspx

For the commonly used 2.4 GHZ  I looked at the Ubiquiti 2.4 GHZ spectrum analyzer external on Amazon that is only $66.  It uses a USB module paired with a common laptop.  The same company (Ubiquiti) also has a module for a 900MHZ spectrum analyzer for around $55.

http://www.amazon.com/Ubiquiti-Spectrum-Analyzer-External-Connector/dp/B002YKU2RA/ref=pd_cp_e_1

Then I thought about buying a used spectrum analyzer on ebay and came across this article.

http://reviews.ebay.com/Buying-a-Spectrum-Analyzer-for-your-Laboratory_W0QQugidZ10000000002149350

So has anyone else out there gone off the beaten track and looked into various options for measuring a wide range of frequencies?  Someone will ask what my purpose is and I would say to get the most specific information about the RF environment around me that I can.

Where I live we have nearby small antennas (150 - 470 MHZ), a cell tower and smart meters (900 MHZ), Neighborhood WiFi (2.4 GHZ) and cordless phones (5GHZ).  

Any thoughts or experience with these different devices?
Linda