I was the one that you referred to as being excited about the price of the exhaust, but I think you took it out of context. I was excited that although it's $5300usd in the states, it's "only" $5690 here in Canada. With the conversion rate as it sits today its cheaper where I am, which made me excited.
I was in your shoes some 15 years ago. I was struggling to buy a used r6 while paying for rent and bills on a $35k salary. I was so set on a ducati 999, and had saved enough cash for one, but I backed out last minute. Just couldn't spend all my life savings on a rapidly depreciating asset. So I bought a used r6 for $4k instead. Now I can buy any bike I want. If I bought the 999 then, I'd be stuck riding a used r6 now (not that they're bad bikes, arguing in the sake of monetary value). You can either live like a prince early, or live like a king later. And trust me, there are always going to be newer and better bikes that tickle your fancy.
Your money, your decision. Just my 2 cents. Good luck.