Sicarian Variants: What Would Be Cool?

So, I have a question today, what variant of what tanks would you like to see most in the Horus Heresy? For me personally, the Sicarian is so awesome that variants of it can only be a good idea.

VIIth Legion WIP: Sicarian

Hello again guys and another finished Item for the VIIth Legion. The work horse of the armoured contingent for my company, the trusty Sicarian. I find these tanks so good, i'm thinking of getting a second to add to the company.

A tale of two Sicarans.

Greetings all Wadey here! It's definitely been a long time between posts but I'm certainly happy to be back! My normal posts are usually about the mighty III Legion but today I thought I'd mix it up a little bit and talk about what IMHO are two of the most potent units and are definite inclusions for ANY Legion, the Sicaran Battle Tank and Sicaran Venator Tank Destroyer.