I... didn't. Never hit a wall before inferno. When I hit 60 I bought a ~950dps weapon for 75k (and a couple other pieces, nothing crazy though, spent about 250k) and did fine in inferno act I. Act II, well... that's a different story, but I've been farming Act I.
I did farm Hell Act 3 Azmodan with full magic find for Azmodan but I don't think it's really necessary if you buy some gear from the AH. Buying a decent weapon (close to or above 1000 dps for a 2hander) makes most of act 1 inferno easy enough.