All the time i’ve been on IRC I have always used mIRC…. for those who dont know what it is here is the desccription from the offical site:
mIRC is a popular Internet Relay Chat client used by millions of people, and thousands of organizations, to communicate, share, play and work with each other on IRC networks around the world. Serving the Internet community for over a decade, mIRC has evolved into a powerful, reliable and fun piece of technology. You can download it here.
Anyway not sure how long it is gonna go on for but you can get mIRC for $10 (50% off) if you buy using this url.