Is 4GB ram enough for the 2.93 imac?

I'm buying a imac 2.93 gh, 4Gb ram, 640 hd. How much ram does the OS 10.5 use? How can I find this info?

I am currently running 4gb ram on a G5 dual 2.0
and am thinking about moving to imac 2.93.
Will I see much difference in performance?
How about performance difference between imac vs ppc on snow leopard?
I usually run at same time:
- safari
- mail
- ichat
- together
- The Hit List
- MacJournal
- NetNewsWire
- pages
I also run very frequently and sometimes at same time as above...
- iphoto
- itunes
Periodically I get a lot of page outs
but I haven't been able to detect a pattern as to why.
Does it seem like 4gb Ram will do ok with this on the imac?
I keep trying to find an article on how memory is handled in new imacs as opposed to how it was handled in ppc...any suggestions where I could read about this?
thanks.

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    Revision: 12007
    Author:   [email protected]
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    Log Message:
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    Revision: 12007
    Revision: 12007
    Author:   [email protected]
    Date:     2009-11-19 12:45:27 -0800 (Thu, 19 Nov 2009)
    Log Message:
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