Dread with Plasma Cannon, Hvy Flamer and Extra Armour
I've had good success with the standard kit chaos dread loaded out with plasma cannon, hvy flamer, DCW and extra armour and I've discovered that when I roll fire frenzy near my own troops I usually miss due to the scatter dice so I"m not as scared as I once was to run them. The melta is a great choice against tanks while the plasma cannon is great against hordes and hvy infantry.
Oh, and many people on this forum point to the vehicle targeting rules via LOS to avoid shooting your own troops that are placed behind them, but sadly in my local area no one interprets the rules that way, not even at the GW tournament level, and until GW faqs it, it will always remain a bone of contention. Just ask your opponent how they interpret the rule prior to playing so that your game isn't ruined by "I say, you say" nonsense.