I really like the fluff and the models for the Ultramarines Honor Guard. As more Grey Knight rumors became available, it started to seem like their new codex would make a good basis for a Honor Guard counts as army.
It seems like an easy enough thing to do, but playing a count's as army can be rather trying. For instance; the only HQ model that could lead an honor guard force is Calgar, but you can't equip a grand marshal with two powerfists. Now you have to explain to your opponents every game that those two really big fists are actually a demon hammer and psycannon. It can be confusing for your opponents, and I don't want to be accused of being a flavor of the month player.
There are advantages to running the counts as army. I already have most of the support units I'll need, like rhinos and dreadnoughts. I probably will only need to buy a tactical box and grey knight strike team box to fill out a basic 1500 point army. I'll probably get a Dreadknight and a Stromraven too, since I like the models.
Dude....I could convert Calgar as the driver for a Dreadknight! That could totally work! Wait, now who am I going to use for my Grand Marshal?
So what do people think? Should I go down the counts as route, or start a Grey Knight army from scratch?