I thought this was one of the nicest 40K armies at 2005 Conflict Vancouver. It had a display an unusual army selection, it had a Forge World Flyer, it was yellow (a tough color to paint), it even had purple accents. I never carefully examined the final outcomes so I don't know how it finished up in the scoring. But I liked it.
Sentinals were all the rage in Vancouver. Many armies had many squadrons of them. Some even appeared to have maxed out which would be nine Sentinals. I've been playing against the Guard a lot lately and have yet to face a single Sentinel.