I personally go for a "combined arms" list. In basic terms: a fotslogging vehicular army. For example: I take two maxed out combat squads including neophytes armed with assault weaponry and flamer/plasma gun, two minimum fire support squads with bolters and whatever heavy weapon I feel like mounted in rhinos, a venerable dread for closecombat support, a longrange tank hunter dread and deepstriking assault termies led by my Chaplain. The Emperor's champion will often take the "uphold" vow, my castellen just joins one of the assault squads where and when he's needed. And there's only one technique here: MOVE THEM FORWARD WITH THE LONG RANGE SUPPORT. Rhinos make excellent cover btw

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O'er the Hills and O'er the Main,
Through Flanders, Portugal and Spain.
King George commands and we obey!
Over the hills, and far away...