Apple's move to OSX caught my eye since I was so into UNIX back then. I didn't really yearn for a Mac until the G5 iMacs came out. I told myself that that was my next computer. I started hearing about noise issues and I learned about revision A Macs. I waited for the next revision.
The next revisions came out but I didn't have the cash so I waited for some extended no interest plans from CompUSA. The long term no interest plan I was hoping for never materialized and as I waited, I then find out about the move to Intel.
For longevity of investment and the possibility of installing other OS's, I decide I want to get an Intel version but now I have to wait until revision B's came out. Revision B's come out but I was hearing about the Core 2 Duo's and 64-bit so I wait some more. C2D's are released and now I wait for my extended no interest plans to materialize. One comes up but it is too close to this past MacWorld so I don't pull the trigger.
Nothing happens to the iMacs during MacWorld so I decide I'm going for it. I didn't get the long term interest free plan I wanted (a year shorter than what I wanted) but it doesn't really matter, I'm having a blast with my 20" iMac C2D. Now I'll have to shell out for Leopard upgrade and iWork 06 and 07 but again, it doesn't matter, I'm having a blast.
Long story short: if you need it now get it now, if not, wait, BUT don't wait too long, you're missing out on a lot of fun.
-ken