I'm in a similar situation, and I intend to split the difference. I have a G4 iBook (1.33Ghz, 1.5GB RAM) and G4 mini (1.5Ghz, 1GB RAM). Just a word of caution - I run Tiger 10.4.11 on both, because Leopard is actually slower on G4 lower end macs... that's a confirmed fact. If you think your mini crawls now, just wait until you install 10.5 on it! It will be atrocious. My recommendation is to upgrade to Tiger, which was faster than 10.3 on PPC machines, and which has almost the same feature set as Leopard, but is more stable.
I wish I could wait until the next revision, but I can't, so I must buy my i7 with the current revision A. My compromise is to wait until mid-January before ordering. I hope they find fix for the flickering and yellowing until then. Frankly, I'm not sure that they'll necessarily solve the yellowing issue even on the next revision, but the flicker I'm confident they'll solve - and must acknowledge, which is why I feel OK buying in January, cause they'll just have to repair it, if it goes bad (I'll send it back if it happens in the first few days though). The flickering is not happening to 100% of the units, so I feel OK taking a risk here. I'm more bummed out by the yellowing thing - if it's very slight (there appears to be huge variation between units), I'll keep it, and I am not sure a cure is on the horizon, though who knows. Regardless, waiting until June is not an option for me - I need a good editing rig, and I don't want to buy a MP.
Anyhow, all I can do right now is monitor boards to see if there's any progress with these issues on newer builds of the 27". It seems like week 49 & 50 are slightly less problem prone (though by no means with ZERO problems), so I'll keep waiting.
Good luck to you, and I'm taking the plunge mid-January!
