Good. You have the Rev 2. That will work on the 2500K. Just not sure how well you can overclock with it though.
As for the 900, its nice to save money but as I said its a outdated case with a few issues. The biggest is the PSU. The PSU fan will be fighting the GPU fan for air.
As for the Lanboy, still not a fan of the HDD mounting nd the cable management is meh. Plus all the ones we have at work for some reason the front 3.5mm jacks don't work right. Wont hold the plug in. Not sure if it was a bad batch or just the design.
I don't plan to OC right off the bat since I don't even know how yet, so for now the fan is alright?
Other than the case, which I can change any time but i've never had a problem with how the PSU is, is the rest solid?