Well the fact of the matter is the Virus KB was a good synth 'then' and still is 'now'. Alot of people still have them and yes....if your after the Virus sound....then its more than sufficient.
Let me guess....your getting the Virus KB off SOS for ?400. Man, you can't do better than that. Virus KC's go for like ?800-ish. Go with the KB.
I dont think Per will mind me linking his sounds....but check this out >>
http://www.perkristian.net/Virus_KB.htm
DS