I think I prefer Merchant Guild, simply for the Coin Tokens you get for every buy. You could conceivably spike Province or double Gardens with that later on. Haggler is great too, with a free Silver/Oasis for a Gardens. But I like winning Gardens splits. First order of Business is to not lose the curse split, and because of cycling, I'd open Oasis/Potion, and on 5/2, I curse my luck and --/Potion. On first $5, I'd buy Merchant Guild/Haggler (leaning to Haggler, Merchant after), I don't get more than 2 Familiars, and start buying Phil Stones after that. I think I like Oasis over Silver pretty much all the time, since you're not going to be drawing with Library, and cycling is good.
I think there is potential room for Wishing Well, but when your deck is going to be full of sloggy crap, I don't think it's worth its buy here.