I've had good luck with GRP,MGP, and Bill Miller. I personally use GRP because I talked with one their reps at PRI one year and he really knew his shit, but if a customer insists on MGP or Bill Miller I have no problem using them either. I can call GRP on Monday and tell them what length I want, what it's intended use is so they can determine what rod bolts to use, and what piston I'm running so they machine the small end for clearance under the piston and have the rods on Friday. I think the longest I've ever had to wait for a set was 10 days. They also own Windberg cranks and can piece together some really nice rotating assemblies. MGP is owned by the guy who started GRP.