A couple of others are:
Xcleaner -
http://www.Xblock.com
Aluria Spyware Eliminator -
http://www.aluriasoftware.com/
Sunbelts Counterspy (Uses Giant Antispyware Engine -
http://www.sunbelt-software.com/product.cfm?id=410
Ewido -
http://www.ewido.net/en/
Mcafee Antispyware -
http://download.mcafee.com/us/eval/evaluate2.asp
Most of these you can try before you buy.