I would say Dont completely switch. Get the FREE OS for PC's
UBUNTU Linux!
Just order it on their website...its totally free! and it boots right off the CD
As Far as the best choice for Amigas.
Get the A1200
its the super easiest straight foward solution.
Forget Internet browsing unless your downloading stuff from AMinet.
You can hoever Use
Yahoo messenger (JabberWockey)
MSN Messenger (Epistula)
AIM (AOL Instant Messenger) (AmigAIM, JabberWocky)
IRC (AmIRC, WookieChat, BlackIRC)
Jabber Wocky
ICQ (StrICQ)
Gadu Gadu (Gadami)
HotLine (AmiCOMSYS)
Amiga is much more fun for chatting!
also the A1200 with WHDLoad is best for Gaming......get a 68030 @ 50mhz and 16 to 128Mb
also a wireless PCMCIA card (16bit)
add USB (Subway USB at AmiKit)
and your good to go!
if you want something for viewing internet on Browsers..........then you need to spend tons of money and get an A4000 with Gfx card and 68060 minimum, or an AmigaONE