Thanks for the comments and rep everyone.
As promised, I've gone and gotten myself distracted again.
I was on the train from Bristol to Neath and I thought to myself 'how many lascannons can I cram into an armylist?' So with a 2 hour trip to fill time with I wrote an army list with as many lascannons as I could cram into it. I'm not building the list, but I decided that I really, really want to have some lascannon armed sternguard now. The good news is that I already have 5 sternguard painted. 1 of them does have a heavy flamer, but I'll replace that one easily enough with a lascannon veteran.
I really should get on with the assault marines and drop pods, but this guy is going to look sooooooo cool when he's finished.