Two thing's I'd watch out for in the Solo:
The video card length and its fit against the hard drive bays.
The heat from the CPU rising into the PSU causing it to ramp up (assuming your using a 120mm fan PSU).
I still forsee you having heat dissipation problems with the Solo for a system with a mid/high heat CPU and GPUs and 3 hard drives. It would be hard to keep quiet and cool with 2x92mm fans (@5v?) up front and a 120mm (@5-7v?) fan in the rear.
With 3 drives, the Solo isn't upgradable anymore... (unless you use the 5.25 bays) I'd consider something bigger, such as the R3 or P183 or maybe even a 300/ CM elite.