Cisco Small Business Support Community Manager
It depends on what you want, but what has been tested to work and I know work with the SPA-500 range is as follows:
I have not been able to test any of the other wireless ranges, basically we only ever buy what the customer can afford and they are the cheapest ones without blowing a budget.
If you want slightly cheaper headsets then the Jabra Corded headsets are normally about 10% cheaper (Well in my neck of the woods) but the Wireless CS60 is the most popular, the only issue is you might have problems getting it to work with the SPA-500S module if you put one on it, I am having great difficulties with that right now, but I am sure I will find a way around it.
Hope this info helps you out.
I am not sure if you found what you are looking for but these headsets from Acoustical innovations work very well and are a bit less expensive.
For what it's worth.
I believe this model would work with the 7900 series phones. For SPA series phones, you need a different jack, which is just a regular audio with a mic pin jack. Look on the right side of the phone and check out the jack. The SPA headphone has a jack like blackberry/droid/iphone phones do, just not stereo.
For $20 these are a great deal http://www.voiplink.com/Cisco_SPA504G_Headset_p/cs1e25mm.htm I've used dozens of them and they work fine for light use. For call center installs I use something with noise cancellation, usually the Plantronics H series (the versions with the "N" are noise cancelling). As mentioned above you need to use a 2.5mm lower cable for the H series headsets to work with the SPA phones.
I think that first headset you mention is pretty much junk. sounds horrible and breaks frequently. We tried those and decided it was a waste of money. the H series is pretty good. Just expensive for whaat it is.
We finally settled on the ones from AI headsets and they work very well and are almost half the price. Doesnt take a rocket scientist to go that direction.