Okay, I'm gearing up for an RTT on Oct 1st, and I'm retooling my Iron Warriors list to include the awesome 2 new forgeworld dreads I got.

I now have a faster Warsmith decked out for close combat, that will be riding along with the troop squad in the rhino. Then I have:

8x Iron Warriors, bolters, 1x plasmagun, 1x lascannon 1 is upgraded to an aspiring champ w/ BP & PF.

8x Iron Warriors, bolters, 1x plasmagun, 1x lascannon 1 is upgraded to an aspiring champ w/ BP & PF.

8x Iron Warriors, bolters, 1x plasmagun, 1x lascannon 1 is upgraded to an aspiring champ w/ BP & PF.

9x Iron Warriors, BP & CCW, 2x meltagun 1 is upgraded to an aspiring champ w/BP & PW & Meltabombs

2 Obliterators

2 Obliterators

Dreadnought with twin-lascannon and extra armour

Dreadnought with twin-lascannon and extra armour

6x Havoc squad 2 bolters, 1 heavy bolter, 2 auto cannons, 1 lascannon

So here's where I would like an opinion. What 4th heavy should I take?
I have:
Predator w/twin-lascannon sponsons can be either HBs or LCs.
Defiler modeled with the autocannon and heavy flamer
Basilisk.

Any thoughts?

Hmm, hard choice. A basilisk or vindicator is pretty much de facto for an Iron Warriors army, however I like the defiler (well, scorpion style, not GW's vision ) too. I tend not to bother with a havoc squad and take a couple of smaller CSM squads with lascannons and the tank hunter skill, but I'm tempted to try one out - just have to find enough heavy weapons to put one together

Dan