Honestly, Upgrade/Chapel was my first thought. Stables is largely about discarding Copper to find your better Treasure (or engine parts), and to me that conflicts with trying to get rid of your Copper ASAP with a strong trasher. Upgrade can get you Silvers from your Estates and later from your Chapel itself, so that it doesn't end up as a dead card.
I think just taking a Smithy is fine for draw here, too. I played Upgrades speculatively, and when they didn't hit what I wanted, Silver-> Smithy, Smithy->Upgrade and Upgrade->Gold don't really hurt (as long as you have an eye on the count of each, I guess).
http://dominion.isotropic.org/gamelog/201211/22/game-20121122-205430-7caf0f35.htmlAnd yeah, Remodel is nice too (Colony->Colony when ahead, Platinum->Colony when desperate) as usual.
ETA - going to try to make the argument a little clearer. With Chapel, the goals are (a) trash 4 cards at a time; (b) get better Treasure while you still can. Yeah? So.
Stables doesn't help you trash 4 cards, because you can do that whenever you want anyway.
Stables doesn't help you get better Treasure early, because:
Say you draw it in a way that you end up not colliding with the Chapel. Okay, if you're incredibly lucky, you might draw Stables-Copper-Copper-Copper-Copper, play Stables, discard a Copper and draw 3 more, for an early Gold. But otherwise, you're buying a Silver that you would have been nearly guaranteed anyway. In fact, it would be 100% guaranteed if you had bought Silver instead of the Stables, and then it'd be your second. Plus, even if you did get that draw with the Stables - if it were a Silver, you'd still get the Gold, so the only benefit you got otherwise was deck cycling. The Silver is actually much more likely to get you that Gold, since you don't need a lucky action-draw to go along with your initial lucky hand draw.
Now, say you draw it in a way that *does* collide with the Chapel. After the discard and draw, you have 7 cards in your hand, 1 of which is Chapel. You want to use the Chapel to trash 4 cards, so now you only have 2 in hand. So you can't afford Silver now, or else the Stables cost you a card worth of trashing. Granted, sometimes Silver will, too, but the point is that Stables certainly doesn't *help* you here.
Now, let's consider Upgrade.
Draw it not colliding. There's a very good chance it lines up with an Estate; even if you drew Upgrade with 4 Coppers, there's now a 3/7 chance that you pull Estate into your hand with Upgrade (Actually, 1/2 as a conditional probability, since this is the "not colliding" case). So now you got a Silver, and helped the Chapel to trash.
Draw it colliding. Well, the Upgrade's trash is redundant with the Chapel's, but at least it didn't *reduce* your trashing capability (the way Silver would have, by virtue of being an unsuitable target). Plus maybe you get a Silver out of it.
The only thing you sacrifice vs. Stables is the *tiny* chance of an early Gold, and a bit of cycling that I can't really imagine mattering.