Gaming Pc First Build Help And Comparison

So, recently I posted about a build I wanted to do and asked for some advice. In return, this is what my final build would contain...

Case: BitFenix BFC-PRO-300-WWXKW-RP Prodigy White mITX PC Case

Motherboard: MSI Z77IA-E53 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 Mini ITX Intel Motherboard

CPU/Processor: Intel Core i5-3470 Ivy Bridge 3.2GHz (3.6GHz Turbo Boost) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 2500 BX80637i53470

RAM: G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL

Hard Drive: SAMSUNG Spinpoint F3 ST1000DM005/HD103SJ 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

Graphics Card: EVGA SSC 02G-P4-3653-KR GeForce GTX 650 Ti 2GB 128-bit GDDR5 PCI Express 3.0 x16 HDCP Ready Video Card

Power Supply: CORSAIR Builder Series CX500 500W ATX12V v2.3 80 PLUS BRONZE Certified Active PFC Power Supply

SDD: Kingston HyperX 3K SH103S3/120G 2.5" 120GB SATA III MLC Internal Solid State Drive (SSD) (Stand-Alone Drive)

The total cost is about $930.
my budget is still under $1000 but really I want to be as close to $800 as possible, and still my goal is to play games like Skyrim, BF3, Arma II, Ect. on high or ultra graphics and yet have the computer be smallish and compact so if I'm in dear need to take it to a friends house or somewhere then it won't be a big pain.

What I am now asking for is a review on my second set up which rounds up to about $915 or if possible give me any ideas on how I could make one perfect for my needs and/or how to combine the two. (or simply the a cheaper solution closer to $800).

My second setup:

Case: Rosewill LINE-M Micro-ATX Mini Tower Computer Case, Dual USB 3.0, come with Dual Fans, Support up to 4 Fans, 12.5" card fits!

Motherboard: GIGABYTE GA-Z77MX-D3H LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard

CPU/Processor: Intel Core i5-3470 Ivy Bridge 3.2GHz (3.6GHz Turbo Boost) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 2500 BX80637i53470

RAM: CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CML16GX3M2A1600C10R

Hard Drive: Seagate Barracuda ST1000DM003 1TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive

Graphics Card: EVGA SuperClocked 02G-P4-2662-KR GeForce GTX 660 2GB 192-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card

Power Supply: XFX Core Edition PRO550W (P1-550S-XXB9) 550W ATX12V 2.2 & ESP12V 2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply

SDD: OCZ Vertex 2 OCZSSD3-2VTX120G 3.5" 120GB SATA II MLC Internal Solid State Drive (SSD)

So any Advice helping me in this first time experience would be greatly appreciated.