I have had a few logos designed over the years, and paid various amounts from £35-80
I run a business group, and a few of my members have paid £250.
It really depends what sort of logo you want. If you just want a basic basic logo, you can do it yourself online (lots of free logo sites, that create a very simple font and swirl design).
Or play around with font libraries with all of the free fonts that are available for commericial use.
I have just had a new logo designed, and paid more, but it is an actual illustration of people, and well worth it for what I needed.
Or, as people said, use the one that lots of geeks have been happy with. But options are always good!