Zioxide is correct. Snow Leopard (10.6) won't support non intel processors. iLife 2009 already doesn't fully install on non intel. I think iMovie is incompatible. So it doesn't make any sense for most people to spend real money on a non-intel machine.
If you know what you are getting into, have another machine that is more modern, and can find a pre intel at a very cheap price, then it may make sense for some people.
I look at computers as a swiss army knife, though. I want 1 that does it all. Having one computer for email, one for video, one for music... etc. is more trouble than it is worth for most people.
fair enough for you, but the OP wanted a computer for light surfing on the sofa in addition to their main imac.
However, to say that...
'buying anything powerpc is just a waste of money now'
...is absolute tripe. Almost nobody needs the latest and greatest, and in particular when buying macs, it is their longevity that is often particularly applealing.
Please don't anyone fall into the trap of thinking that you need a super computer for emailing on the sofa