While gorgeous, the FT03 probably has the most stringent requirements in terms of parts selected. For starters, if you want to overclock then a closed loop 120mm water cooler like the Corsair H40/60 is mandatory. There just isnt enough room anywhere else in the case for a decent aftermarket cooler, and Silverstone actually designed the case with these units in mind.
The second is that since the parts are oriented 90 degrees, you have to be very careful when selecting a videocard. Cards with heatpipe designs do not perform as intended, so you will want to go with a reference video card. There are some non-reference coolers that will perform adequately, but you need to check specifically with the card in mind before purchasing. With all of that hot air dumping into the system, Id still advise against it. Considering that AMD reference cards are still fairly loud towards the high end, if you want a computer that performs quietly, you will want to go with a 660Ti, 670, 680, 7850, or 7870.
The third consideration is that since airflow is fairly poor, you will want to replace the bottom fan with a pair of high pressure/CFM fans. Swiftech Helix, Scythe Gentle Typhoon AP-15, Noctua NF-F12, Noiseblocker Eloop 1300/1900 RPM are what you want to be looking at.
