Scottish Yarn

My parents recently took a trip to Scotland, and very sweetly made an effort to go to New Lanark (about an hour outside of Edinburgh), which is a UNESCO World Heritage site featuring an 18th century mill, which still produces wool and textiles. They very thoughtfully brough tme back a sweater's worth of yarn:

Sorry for the lousy photos, it's been overcast and raining every morning this week. 

I love the colour! It's  beautiful donegal tweed yarn, 90% wool and 10% silk, and I'm really looking forward to knitting up a gorgeous winter sweater to cuddle up in.  Now, there are three things that are looming large in my mind to potentially make with all this gorgeous, gorgeous yarn:

Now technically,  Peterborough (the first one) and Nidden (the second one) call for worsted weight, and this yarn is DK (which Nespelem calls for). The trouble with Nespelem is that I find myself leaning more towards Peterborough or Nidden, because I like the long look and the drapey style. And when I look at the other FOs, peopel have been using DK weight for both of those other sweaters as well, with lovely results; and they  all call for 4mm or 3.75 mm needles, respectively. Which means I feel pretty confident about subbing in some DK and just have a slightly lighter weight cardigan if I decide to go for Nidden or Peterborough.

So what do you think? I'm having a tough time deciding, and sure could use some advice from you guys!