I'm going to be the antagonist here. If you've got the cash and can spend an extra $500, I'd go custom. I'd go SRAM Rival (only available as a double/compact) or 105 or Ultegra (a bit overkill) and swap out what you want for XT stuff.

If you don't have a LBS, you might give Tom at gvhbikes.com a call and see what kind of price he could put one together for you or simply sell you the build kit. The advantage with going with him is that he won't charge you full MSRP price for the custom build kit. He charges you a bit more than would cost if you parted out a new stock bike. He can get you anything your heart desires. No junk. Take a look at his build kit builder on his web site. The prices are basically unbeatable anywhere but Fleabay. The advantage goes to GVH though since it's all in one, legit and safe.

If you do some research before you buy, you could build one up and easily shave at least 5# off the stock Surly. $100/lb (assuming an extra $500 for custom) is pretty good in road bike land.

You at least need to do due diligence...!