I finally have a large fully painted Chaos Force that I always wanted years ago.
...What, you make an announcement like that and then post no pictures? You monster!
I have to admit that looking over your list, it seemed to me like 2nd edition would be the perfect size for those warbands. I understand about the sea of card in 2E games, but actually there are three main sources of it cluttering the table:
1) Wargear cards. Honestly, these are now just wargear descriptions in the codex instead, and you just write the wargear name under your character when you buy them it. You could just do the same in 2E, and leave the cards in the box. If you're feeling up to it, you could also write all the cards onto a summarised cheat-sheet for ease during list building.
2) Vehicle datafaxes. I never much liked how vehicles worked in 2E. Yes, they were detailed rules, but they just took forever to resolve if you had anything like a unit of 5 bikes and a couple of tanks/dreads. For vehicles, I'd use one of the later systems instead (5th was quite decent), and adjust the armour values to the 2nd edition datafaxes. This also makes bikes a better prospect for marines and orks, since they are just model upgrades rather than vehicles. As you only have a Rhino and a Dread, I doubt you'll have much problem whatever you do.
3) Psychic phase. Cards for everything here, plus piles of unique effects templates. I've been tempted to bodge in a WHFB magic system from 6E-8E, and then adjust the casting values of 40k cards to suit. As the WHFB systems from 6E-8E used dice rather than cards, it does create much less clutter. Then again, you can just skip this altogether and use the psychic power rules from the core ruleset instead, which although basic doesn't have any cards anyway.
As for missions and stratagems, I don't mind those being on cards - it's only a couple per player, and it's helpful to have a reminder of the mission to hand anyway. Apart from Virus Outbreak (which we were all told to remove anyway), the strategy cards are a nice bit of oldskool random fun.
Buuuuuut.... All that said, I did like 3rd and 4th edition quite a lot as well; in particular the streamlining of the melee and vehicle rules and the removal of card clutter was a big draw!
I also liked the mission scenarios too, as I felt these were more coherent and led to better games.
I think the Lost and the Damned list from the eye of terror campaign was the single greatest army list ever written for 40K it was everything I ever wanted in a chaos 4Ok army traitors, mutants IG tanks the possibilities for that lists seemed endless.
The 2nd edition list in the back of the Chaos codex was also reasonably good in this respect, especially if you allied in from the other lists in the same book (i.e., a few Traitor Marines, who were probably assigned to your force as overseers to ensure your force did what they were supposed to).