Those are very high settings. With SR1 you should be able to get comparable results with much lower settings and shorter render times. My rough guess would be that you should be able to get decent renders with indirect samples somewhere in the 200-400 range and the irradiance caching for IDL in the 0.2 to 0.5 range. Start low and work your way up.

You may also want to experiment with a higher tone mapping exposure. And, this is just my personal taste - for a slightly warmer appearance, try adding a slight yellow tint to either the lights or the walls.