...but it's a god damn Dodge Viper!!!!!

I knoooow!! I would have a hard time passing that up as well, but if it wipes out your savings I would say no.

For one it always seem like when you spend money you think you can afford to spend, something else major pops up you could of used the money on.
(Or maybe that's just my luck!)

If it was me I would ask the buyer to give you a little more time, which will more then likely happen, if they are not offered more money from someone else.

Then I would save up for another month or two, just to have some back up money.

I'm not a very big fan of loans either, and as you said the interest rate will be high, which will just shaft you in the long run! So I would stay away from a loan.

So what I guess I am trying to say is wait til you can pay in cash, but still have backup money for unexpected problems. It's always better to be safe, then sorry!

Hope this helped.