I have 1.6 and source. My dedicated server, which is hosted only on LAN is Source. I haven't touched 1.6 in years and Source in more than a month. I am, however, willing to take you on at 1.6.
Are you really hosting a CS server? And if so, is it the original 1.6 or Source? If it's 1.6, I'd love to drop by for a few games some time.