Ok - Silverstones are much higher quality than InWin, so maybe it'll look better in person for you.
I have a couple other suggestions. The low wattage I3 is going to be a lower performer, and it costs more money. I run a I3-3220 with a GTX 660 in a Silverstone SG08 in an HTPC/Gaming PC, and the I3 stays cool in the Silverstone case. The SG05 will give similar cooling performance.
Plus, that low profile sapphire card is nice, but it's priced at a premium for low profile. If you go with the Silverstone case, you can upgrade the GPU by several levels for about the same overall cost. Here is an updated build for $10 more than your build. This will give you MUCH better performance overall.
PCPartPicker part list:
http://pcpartpicker.com/p/1J6q3
Price breakdown by merchant: http://pcpartpicker.com/p/1J6q3/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1J6q3/benchmarks/
CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($129.98 @ SuperBiiz)
Motherboard: ASRock H81M-ITX Mini ITX LGA1150 Motherboard ($71.97 @ Newegg)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory ($54.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Video Card: Sapphire Radeon HD 7790 1GB Video Card ($109.99 @ Newegg)
Case: Silverstone SST-SG05B-USB3.0 (Black) Mini ITX Desktop Case w/300W Power Supply ($102.98 @ Newegg)
Optical Drive: Samsung SN-208DB/BEBET DVD/CD Writer ($19.99 @ Newegg)
Total: $549.88
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-29 21:37 EDT-0400)