HI5 nuker setups revolve around a core of SpS, Sorc, OL, 2 Cardinals, EE, BD, SWS. The last slot can be taken by pretty much anything: Necro, SpS, Sorc, SH, SLH, EE, SE, HK, Glad, EM.
As tendencies go, most parties prefer to have the EM oop and one mostly benefits from this in 9v9s. The presence of the EM, taking a party slot, is useful during sieges (mobility, faster regroup, constant gift of Seraphim).
Top Russian parties seem to favor the SE, relying heavily on mana burn and on their ability to make heroes (the more diverse the setup, the more hero candidates). The EE has an even better potential in mana burn fights scenarios due to BoE, but lacks that wonderful Prophecy of Wind with the magical critical damage and HP bonus.
Personally, I consider SH to be inferior to Necro, SpS, Sorc - unless that SH can be made hero. Also, I am somewhat reluctant towards the SLH, although, recently, I have seen impressive displays from such a party. The Necro is superior to SpS and Sorc, in the sense of diversity and hero opportunity (as mentioned above) but other than that, it remains purely a matter of play-style and personal choice.
The HK variant is mostly dependent on the player's ability to use the insane crusher, effectively. The same principle applies to the Glad setup - with regard to mana / charge management.
Finally, it's worth mentioning that in measuring the actual success rate of a party, the ability to out-level, out-gear and "out-hero" your opponents, takes precedence over setup.