Soft 18 vs 2

[ace-o-aces]

OK, i've got a question on basic strategy. Given the following conditions:
6 deck shoe
Dealer hits on soft 17

If I draw an Ace and a 7 and the dealer shows a 2, do I stand or double down? I've seen both listed as correct.

 

[Unshake]

http://www.blackjackinfo.com/bjbse.php?numdecks=6+decks&soft17=h17&dbl=all&das=yes&surr=ns&peek=yes

Strategy engine says double.

 

[callipygian]

I've seen both listed as correct.

One set was probably for S17, where soft 18 vs. dealer 2 should be stand. H17 causes quite a few strategy changes - soft 18 vs. dealer 2 (S->D/S), soft 19 vs. dealer 6 (S->D/S), hard 17 vs. dealer A (S->R/S), hard 15 vs. dealer A (H->R/H), hard 11 vs. dealer A (H->D/H). I'm going to feel like a heel if I left one out, but I think that's it.

The blackjack basic strategy engine on this site is the best free one on the Web.

(Edit: to be clear, I have no financial incentive to be pushing this site. I found this board because I liked the engine so much.)