IMO a warboss is a must, make sure it has a
PK. With a slugga this means 6
PK attacks, ouch. Take on one a warbike if you are going to feild speed freeks. Warbosses are bril
I have a Mek at the moment, which is good as its
KFF provides good cover. Not all my orks have a transport yet (i have 5, soon to be 6, armies to split between) so its good for the foot slogging ones, a Goff must have. Its even good to prolong the life of an otherwise very vunerable trukk.
I'm quite torn whether to get a weirdboy (warphead of course) to replace my mek. They're decent in combat-4 I4 S5 attacks on the charge- and can really help beef up a squad of boyz. He can teleport the boyz, make a Waaaghhh! and give each boy in his squad an extra attacks. Not to mention the devastating shooting attacks on the chart. If i did get one
id probably put him, along with 19 other boyz, in an open-top BW. He can then fire out of the wagon and perhaps I'll get lucky and get that +1 attack on the turn i assault.
Of course there are lots of great special characters that are good and also fun to play. My favourite is Old Zogwort purely because of his ability to turn someone into a squig. There's wazdakka as well, a great addition to a speed freeks army (i must get round to converting a model for him) and the Mad Dok's good too, not forgetting the prophet of the Waaggh! himself, ol' Ghaz.