Well, as I'm doing a street-level campaign which will start in southern Seattle/western Auburn/northern Tacoma, I'm gearing my contact list towards that, and most of their fellow shadowrunners would be on that level. So, 2 for the most part, with maybe a couple of higher-tier runners being 3's.
It doesn't help my state of mind in planning contacts that the three PCs already made all dumpstatted Charisma - I mean, not much choice in the matter, two are magicians and one's a rigger, but still, I think once they see the contact list they'll want to redirect some of their Karma to them.
There's a fixer for each area, a list of cops/yakuza/Mafia from high-rank to street monster, and a smattering of other essential shadow contacts - many of which are from precon adventures. As I'm running my game in the 2055-era and am planning to bring it all the way to post Dunkelzahn's death (though, as they know of it already, I may have them on a run where they think they can prevent his death, buuuut...)
*looks at time* ....Iiiiii should not have stayed up this late reading System Crash and catching up on the post-Renraku Arcology stuff. Doesn't help that for some reason my archive is missing Brainscan.