Transportation is hardly a must. Sure, it's nice to have 1 or 2 rhinos rolling about, but it won't really be game changing unless you're trying to pull an eldar "zoom around turn 5 objective grabbing"
I would hardly say that about Praetors. Close combat beasts that are a rather useful force multiplier Both with the ROWs and the fact that they can reliably pop 4+ marines/terminators at I: 5 I would say try not to spend over 200 points on him as loading him up with a paragon blade and power fist gives him a stupid number of attacks, ESPECIALLY with the IF bonuses to challenges.
Imperial Fist termiantors (and Night Lord terminators) can deep strike as their legion rules. Additionally, speaking as someone who frequently uses foot slogging terminators: you're putting to much stock into overwatching, combi-weapons are fine for keeping them cheap and giving them some basic ranged outbut, and power weapons includes mauls and axes, which are just fine for Anti-infantry. If you're cataphractii aren't doing anything 'till late game, you may be playing them way to conservatively
MoS is fine, but that would be a silly idea. He should be sitting back with a ranged squad to bump them to
BS: 6 (if they are using bolters) or
BS: 5 otherwise. Boarding shield could be a good idea, but the plasma pistol is over-costed in the best of situations, more-so when you have him hanging back with a ranged squad. Leave him as bare as possible w/ Artificer and some source of an invuln. MAYBE a power weapon at most.
Tac squads w/ extra
CCWs are pretty decent when you use them right. 61 attacks on the charge (~15 wounds instead of ~10, a 50% increase) is nothing to sneeze at, even for terminators and the like. I agree with the rest though:
AA on the srgt, vox + vexillia. (Vox is a double must: guides in your termiantors, AND guides your phosphex so they can stay better hidden)
I like to keep my apothecaries cheap:
AA is a must, and you should heavily consider giving them the augury scanner. 5 pts. to give a tactical squad interceptor is AMAZING. Beyond that, I occasionally throw a power sword on my apothecaries
He has a point with the contemptors, but a regular one with kheres+fist is just fine as well. Dual kheres is great! Though generally only okay at
AA (24" range kinda sucks for
AA)
He is right on the money with the quad mortars. Give them shatter shells though, and you can mulch through basically anything
AV 13 without much fear
The Sicaran is nice, if not over played, but as an Imperial Fists player, pull out the heavy support squads as the IF rules give them all tank hunter, which is amazingly fun.
Spartans are SUPER expensive, durrable, but expensive and easy to play around. You would need to bring a primus medicae to put with the terminators, since apothecaries cant. P.fists would be a good idea, but don't stess over it. Transports are NOT as manditory as they are in
40k as most of your transports will die stupidly fast, leaving only gimped infantry squads to compete with any larger infantry squads on the board. Remember: in 30k It's cheaper to bring 1 20-man tactical squad than it is to bring 2 10-man squads. Melta and
Plas Support squads are also stupidly expensive, and you, as an IF player, have better access to tank killing and infantry killing in your list.
Praetors are fine as beat sticks, and termiantors, when used right, can be amazing in 30k, even when foot slogging. NEVER underestimate the 4+ invuln save