Usually if i am below tier 4 before i hit 9 gold i go for top4 so yeah, around 8-9 when you get your first t4 triple into a solid build-enabling t5 minion
Issues there involve a) hitting a triple on the turn you hit TT4 (or even the next) and b) Hitting something build defining from that (and not ending up with a sneed's or the 7/7 beast because there's nowt better, which just doesn't actually do much). It's well under half the time that you can do both, in my experience. When I hit 9 gold, I'm usually going to to TT4, unless I'm someone like Omu that powerlevels. But that's the right line of play to aim for, at least, as it was before?