Game 5: my Space Marines against some Imperial Guards (1000 pts each, Duel scenario).
I won by a large margin. I think I was slightly advantaged by the scenario, and my deployment helped a lot (concentrated on one side of the table).
Imperial Guards are very weak against Space Marines (5+ quality vs 3+ quality makes a huge difference). Ogryns were quite scary however.
Game 6: my Space Marines against some Sisters of Battle (1000 pts each, Duel scenario).
I lost by a large margin. The army list of the Sisters was quite scary (even before the game begun), with lots of tanks (4), lots of heavy flamers, and special rules granting temporary boosts.
My only satisfaction was to destroy 3 of the tanks. In the end I was almost tabled (my only remaining figure was a dreadnought, sitting on one wound).
Some pics now.
A Land Speeder patrolling the outskirt of an abandoned city.
Imperial Guards deployed on top of the warehouse.
Space Marine scouts hiding in the electrical hut.
Imperial Guards are pinned.
The Land Raider replies with its heavy flamers.
Jump Pack squads appear in deep strike.
Sniper ratlings are a persistent threat from their ideal vantage point.
Space Marines try to find cover along the walls of the warehouse.