They are not worth as much as most guys are asking. They were $800 to $1100 when they were new. Used, but in good condition, it still loses value just as with most other firearms. I would not pay more than $600, even for one in pristine condition. The stock is nothing special, merely a Bell & Carlson Carbelite that can be purchased new for $240.
I bought the same rifle, new, from LeBaron, in August 2008, for just under$1000. A wonderfully light rifle, but the barrel is much too thin for any accurate shooting. Way too much whip. Best grouping was 5 inches at 100 yards. Mine is currently being rebarreled at the gunsmith. I still think the titanium is a neat idea, and even with the added weight of a heavier contour barrel, it will still be lighter than most rifles. The end result will be a really nice custom rifle, but I could have done the same thing with a much less expensive action.
Some of the short action models are much better shooters. If possible, I would try to get my hands on either a 260 Rem or a 7-08 model. I know a couple of guys with the lighter, short action cartridges and they are much better shooters. The action is very stiff when compared to any other 700.
Since then I have seen them priced as high as $1800 CDN and $1600 USD for a used rifle. More than the new ALaskan Ti. There are a whole lot of possible choices for off-the-shelf lightweights or other rifles from which you can customize. I came across a fellow in southern Alberta trying to flog one in 30-06 for $1600, but it was beat to hell and it had a heavy, Boyd's laminate stock. Definitely not worth the money.
I also owned an Alaskan Ti. Turned out to be a big piece of crap and had a fight on my hands returning it. It was defective right out of the box. Had several other Alaskans in my hands and all had the same problems with jamming when feeding rounds and failure to extract a casing. The new Bell & Carlson stocks are quite poorly made when compared to some of their older models.
If you want a light rifle, go with a Remington 700 or Winchester 70 short action and put the extra funds into a McMillan Edge stock. Or for even less money, try a Kimber Montana.