Cardie conundrum

I am really excited about my Buttony cardie. The yarn is lovely, the fit is good and it's going to be great for the kind of proper wintery weather we've been having lately. All was going well until, half-way down the second arm I ran out of yarn. I am really baffled by this as I KNOW I had enough yarn. I originally bought 7 skeins (700g) of this yarn and the sweater only just weighs 500g so problem one - where are the other skeins??

I turned my yarn storage boxes upside down at New Year and couldn't see hide nor hair of them. So, I did what any sensible person would do, I ordered 2 more skeins. The yarn is from handpaintedyarn.com so has to come all the way from Uruguay. This took a few weeks, then, on Tuesday morning the package finally arrived, so I wound myself a ball and started up knitting again.

Now, the moral of the story so far is two-fold: 1) don't lose your yarn in the first place and 2) don't assume hand-dyed yarn from September 2007 will match the same colour-way dyed in late 2008, plus, don't knit half a sleeve, sitting on the sofa in bad light watching telly as it may well be days before you notice this little problem!

So I find myself here:
with a half a sleeve (on the right) darker and less varigated. This flash-bleached picture gives you an idea of how much the two different dye-lots contrast.
The problem is too pronounced to just let it go, so my question is, what do I do?

Do I have yet another look for the original skeins? (Did that this morning. Result: no skeins, but I did find the docking wire for my Zen and my mobile phone holder!)
Or, do I shorten both sleeves and make them 3/4 length? (I'm sure this would look fine but it makes the jumper much less practical)
Or, do I rip back both sleeves (boo hoo) and knit them again, doing one round with the original yarn and one round with the new yarn and trust that they'll blend together (and not look too odd next to the colour of the body)?
Or, do I email the suppliers and see if they'll dye some more for me (and thus give up on wearing the jumper this year since I'll have to wait ages for the delivery)?

Any advice greatly appreciated!