I feel like University/CR is the way to go here. Your opponent is giving you a little free trashing with the Bishop, which will help, he isn't signaling an immediate attack via Sea Hag, so you've got some time to get your first (slow) Universities into play, and obviously University lets you buy your CRs easier, even if you trash your money heavily. And of course you get built in +buy from CR. Throw in a Mountebank (off your first University, probably) to slow your opponent down (and chuckle if he's going to try to use a Bishop to counter a Mountebank), maybe another Mountebank once your deck starts to fire, and bob's your uncle.
Obviously it's a bit chancy because of the potion cost of University and the opportunity for your opponent to swap into fairly nasty attacks that could swamp your engine. But he didn't get a lot of buying power in his opening turns, and there's a decent chance he won't get Mountebank during turns 3/4 (lesse: 1/6 that his Silver doesn't get into turns 3/4, and then if it does get into turns 3/4, at least some chance that it doesn't come with 3 [Coppers|Bishop]), and also at least some chance that he doesn't buy Mountebank, since he didn't go gonzo for it at opening, and will be chancing terminal conflicts (especially if he's deck-thinning).
I don't know, I probably have a bias in favor of cards/actions engines, but I'd chance it. Cutpurse seems like a lower risk/lower reward option. It's less likely to screw you, but also less likely to utterly dominate.
EDIT: So, we basically agree that Bishop on turn 1/2 is probably a mistake, right? It's a single-card trasher that gives you the buying power of Copper, and it's a terminal in a set where your opponent is never going to get +2 Actions (because if you don't get Potion in turns 1/2, University is obviously a mistake), and there are at least two other very strong terminals (Mountebank, Council Room), one of which is a hand-size increaser? I don't feel like Cutpurse capitalizes on your opponent's mistake. It's just a reasonable starter. It's probably a better starter than Bishop. But Potion seems like it potentially capitalizes on your opponent's mistake because the problem with University/CR is that it will take too long to get going, but your opponent has chosen a fairly slow opening.