I agree, don't get it if you're not sure... did you figure out which red it is yet?
I remember having doubts about passing on some colors like etoupe, gold and blue this year... but my heart was really set on red (I have a thread with Garance's color in clemence if that helps). Although I had to pay a markup, I'm sooo happy that I have a red in the specs I liked, and I don't have the stress of trying to off-load a Birkin I only had lukewarm feelings for.
I think it's actually quite hard to sell high-end bags unless you have a "reputation" already... there have been some Birkins that looked nice on eBay, but I hesitated on those since they weren't on the "recommended" reseller list, KWIM?