The quntessental veriant is the main one, with its four LPLs. Its almost a watch word for going over the top on a weapon that's just a bit too good, along with the Glass Spider 2 or Black Python. But, like thouse mechs, its not perfict. Its painfuly slow, at 3/5/3, and the jets keep the BV high (2307, which is on par with many Summoners and Nova Cats), so taking a poor pilot is less of a bonus than it might seem. But, its got four LPLs, and with 38 heat dissapation it can keep them in action fairly well if it can find a place to park, or keep three going all the time even on the bounce. Its absolutly worth taking, but just know what you're getting your self into, since a lack of speed, a lack of extreem range weapons, a shortage of pure, raw power and a reputation like it has get it into trouble.
The 4 is probably the next best one, since it keeps the thing that made the prime great, the LPLs, and yet moderates them to remove one of the biggest complaints, that it was something of a munch boat. ATMs are a weapon I love, but they're contrivercial enough that most people won't complain when you plop a IIC4 down on the table the way they might for a model 1, and it can still fight well, gaining in extreem range, in close in power, and in heat efficancy at the expense of some ammo and the lost pulse bonus on its ATMs.
If you're a big fan of the 3/5/5 movement profile, the 5s probably one of the better mechs in that class, but that's not saying too much. The loss of the pulse bonus on a mech made to be very jumpy is strongly felt.
If you're not a big fan of fighters and VTOLs, but your opponent is, then the 6 is for you. Its slow, since it ditches the jets and its got low ammo, but twin HAG 30s can't be ignored. It also works as a support mech, but with no hold punchers it struggles on its own in my experiance to kill other comperable mechs.
The 7, like the 2 and 3, is pretty forgetable.
The 8 is noteworthy in the sense that it takes a totaly difrent aproach to design. It should amost be the IIIC1 rather than the IIC8. It moves 5/8/5, and mounts a ballanced array of twin ER LLs and twin SSRM6s, backed by four APGRs. Its actualy a pretty good little mech, with good weapon choices, ample heatsinks, good speed, and good armor. Its down on big guns relitive to its brothers (or uncles) but its more ballanced, and actualy does similar peak damage. Definatly worth a look, especaly if you're not already too attached to the style of the base model.