Hmm, some very interesting suggestions have come up. I have considered assault marines, but due to their cost have discounted them. Those 10 robed marines, I am not sure where to find them on the site, but I would prefer for them to come with special weapons, to use for something else I am working on. So for now they are discounted too.
I did, however, stumble across the plastic Dark Angels Veterans set. They are plenty cheap for me, and would come with some nice looking options/weapons. I really like the looks of the robes.
However, one problem springs to mind here: I cannot really paint clothes/fabrics that well. A minor setback.
In any case, at the moment the veterans + nemesis force weapons seem the best way to go for me. Looking at the picture on the GW site, it looks like the top left-most Veteran is holding a storm bolter.
Can anyone inform me what you get on the Dark Angels Veterans sprue (if this is allowed)?