Apple Logic Pro /LogicExpress Discussion

Hi,

I upgraded cross platform from Logic 5 Platinum to Logic 6 Pro about 6
months ago.  It was a struggle but I have finally gotten all the bugs
worked out and am competent enough with using Logic 6 to actually get
some productive work done. Check out my Christmas contest entry to
EWQLSO:
http://portelance.thejukebox.tv/songs/hi/A_Christmas_Waltz.mp3
(Is there a way to post hot links?)

I guess I am a little nervous about upgrading
to Logic 7.
My machine: dual 800 G4 with 1.5 gigs of RAM with 2 - 7200 RPM ATA
drives.
My programs: EWQLSO Gold & Silver, Kontakt.  I do orchestral work so I
have a pretty heavy load of samples.  I have gotten the AU validation
fixes for all of my programs.

What do think?  Will my machine handle it and can I expect a
reasonably smooth transition?  Or should I wait until I can afford to
upgrade to a dual G5?

Thanks!

Leon Portelance
Songbird Productions/Kaatza Music
Davis, CA