$1700 Gaming System

Approximate Purchase Date: ASAP

Budget Range: Under $1800

System Usage from Most to Least Important: Gaming, streaming video, programming

Parts Not Required: Mouse

Preferred Website(s) for Parts: Newegg.com

Country: USA

Parts Preferences: Best performance for the price

Overclocking: Eventually

SLI or Crossfire: Maybe as an upgrade later

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Hey guys, I've just been working on this system and I had a few questions/was looking for some pointers. Here's what I've got so far (pluses are shipping costs, minuses are rebates):

CASE: COOLER MASTER HAF 922 RC-922M-KKN1-GP Black Steel + Plastic and Mesh Bezel ATX Mid Tower Computer Case $99.99 - 10 = 89.99
OR Antec Three Hundred Illusion Black Steel ATX Mid Tower Computer Case $69.99

CPU: Intel i5-3750K Ivy Bridge CPU 3.4Ghz $225

MOBO: ASRock Z77 Extreme4 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard $134.99 + 8.00 = 142.00

PSU: CORSAIR Enthusiast Series CMPSU-650TX 650W ATX12V / EPS12V SLI Ready 80 PLUS Certified $109.99 + 6 = 116.00
OR Rosewill CAPSTONE Series CAPSTONE-750 750W Continuous @ 50°C, 80 PLUS GOLD Certified, $109.99

GPU: EVGA 02G-P4-2680-KR GeForce GTX 680 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card $499.99 + 8 = 508

OPTICAL DRIVE: Asus 24xDVD±RW Serial ATA Internal OEM Drive DRW-24B1ST (Black) $18.99 + 7 = 25.99

SSD: Kingston HyperX 3K SH103S3/90G 2.5" 90GB SATA III MLC Internal Solid State Drive (SSD) $109.99 - 10 = 99.99

HDD: Western Digital Caviar Blue WD5000AAKX 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive $79.99

MEMORY: G.SKILL Ares Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-1600C9D-8GAB $44.99

COOLING: COOLER MASTER Hyper 212 EVO RR-212E-20PK-R2 Continuous Direct Contact 120mm Sleeve CPU Cooler $34.99

MONITOR: Asus VH238H Black 23" Full HD HDMI LED Backlight LCD Monitor w/Speakers 250 cd/m2 ASCR 50,000,000:1 $174.99 - 10 = 164.99

KEYBOARD: LITE-ON SK-1688U/B Black 104 Normal Keys USB Wired Standard Keyboard $19.99 + 7 = 27

WINDOWS: $100

TOTAL: $1659.00

So here's my questions. First off, Ivy Bridge is here, but it seems like the overclocking performance is subpar. Should I go ahead and go with it anyway, or should I just go with the old i5-2500k standby? If I do decide to got with Sandy, is it still worth it to get the Z77 chipset on my mobo? Also, is a 650W power supply enough for a system like this? What would I need if I decided eventually to add a second 680? What is the weakest link in this PC right now? CPU? RAM? HDD? Also, I don't know anything about monitors, so any advice I could get on that front would be awesome. My budget for a monitor is about $200.

Thanks a lot guys, I'm looking forward to hearing from you.