Here's the top three time slips from dragtimes.com, arranged by each pulley:

185mm pulleys:
None listed (that I know of)

181mm pulleys:
Jeff Croy - 10.907 @ 127.430 with a 1.688 60' and a 150 shot of nitrous
Jeff Croy - 11.865 @ 117.510 with a 1.715 60' (no nitrous)
Bryan Tracy - 12.240 @ 111.950 with a 1.800 60'
Mike Rydquist - 12.270 @ 111.490 with a 1.818 60'

178mm pulleys:
Cruzinquick - 11.890 @ 117.240 with a 1.807 60'
Rob @ NeedsWings - 11.930 @ 119.340 with a 1.738 60'
Chris Fareri - 11.979 @ 114.890 with a 1.740 60'

Code3 (original size)
Neal Mimikos - 12.175 @ 114.240 with a 1.783 60'
Scott McIntosh - 12.218 @ 112.900 with a 1.781 60'
Mike Kochman - 12.223 @ 113.430 with a 1.830 60'

Of course, this isn't an apples to apples comparison because these are all different cars on different days at different tracks. But it does seem to show that the power of the 181 and 185 pulleys have yet to be truly exploited. I imagine that this will all change this summer with the advent of better cooling mods. I think the larger pulleys will take the lead as long as they can keep cool.