The Silverstone Sugo SG02 takes most of the features of the more expensive SG01 Evolution and offers these at a much cheaper price point. While most of the extras are there, certain things like the rear fan and all-aluminum front are missing. If you are in the market for a white SFF enclosure, you simply cannot get past the Sugo SG02, as the SG01 and SG03 only ship in black or silver.
Silverstone has kept the interior of the SG02 as simple and efficient as the more expensive counter parts, which makes installation a breeze. As with all compact cases, space is a commodity you do not have a lot of, which means you should plan your parts around this case instead the other way around. Silverstone does offer a lot of extras, like a cross flow fan, CPU HSF and power supply which specifically fit the Sugo series. This makes the search for a fitting power supply much simpler, but you do have the option of taking any standard sized ATX PSU if you wish.
Installing a large graphic card is a bit tricky, as you may have to sacrifice the hard drive cage to fit a GeForce 8800 or Radeon HD2900, but this is something a case like this may get away with.