understand that combi-weapons are VERY GOOD
just that paying twice as many points to give every guy in the squad a special CC weapon is the good.
understand that SM Termies are 10pts more than ours, so giving our guys those guns makes us cost the same # of points, but we have worse heavy weapons, no combat tactics, and no storm bolters (our weapons need to get close to be better). so giving all our guys combi-weapons makes them 35pts, and can make them more powerful, as droping 5 combi-plasmas can really wreck MEQ's, or 5 combi-meltas. only get 1-2 chain/power fists after that, because then that makes them not vulnerable to walkers up close.
my main concern for your terminators is the choice of lightning claws, as they take up too many points and aren't as powerful as powerfists. they are only really useful on slaanesh terminators, as they really need to use their initiative, and lightning claws are the only weapon that they can get that lets them become more powerful while using their initiative.
basically, id go heavy flamer+4 combi weapons. then maybe 1-2 fists. no champion upgrades (not worth it, IoK does this to every guy, while saving 10pts per each guy over 2 in the squad. so this saves 30pts to upgrading all of your terminators.), IoK is fine. its pretty good, if you know they will get into close quarters a decent amount, 20pts for this ability is never too much, and it doesn't hurt to add 1-3 more terminators to the unit if they all get +1 attack.....also keep in mind the power weapons hit the nobz first and en masse can really kill some before they attack. drop down, fire 8 meltaguns, melting maybe 5 of them, then power weapons can hopefully get a good amount of them after. also keep in mind, if you drop, you can save combi-meltas, fire 4 at one tank, then save 4 for later in case you need them.
8 terminators, heavy flamer, combi melta x7, chainfist, IoK=315
-this will wreck nobz. IMO of course