ok so heres some extra thought:
the 3G was the model i really wanted a few years back, however i couldn't go for it because my computer had no firewire, was usb 1.1 and was running windows 98. By the time i upgraded to something that i could use an ipod on (my powerbook), you couldn't buy the 3G's new anymore.
Now i have already bought 2 3G models but they aren't in good shape, although i got them cheap, and i have a 4G Colour. So the purchase of the 3G would not be practical but to satisfy this long desire for my own 'pod, as opposed to the ones i have bought second hand.
Also, i will most likely get the 12in powerbook replacement (be it mbp or macbook), in the fall, and intend to take advantage of cram and jam (if it is running), and so will be able to get a 5G then.
So there is a sentimental element behind the purchase, and i am at ends whether to get it or not. Part of me says get it, as you've always wanted a brand new one, while the other (more rational) side of me tells me i am stupid to be thinking about this!