There's a very large selection of Ikea models in the Sketchup 3d Warehouse - I'm not sure who keeps things up to date there, but that pretty much fits the bill for what you're asking. It's actually how I designed my study, and I ended up rearranging the furniture three times (virtually) before deciding on what I needed to buy, and I'm so glad that rearranging was done on my screen and not on my floor.