new SSD for old Chassis

My 7 1/2 year old Digital Storm desktop (order #15192) is still going strong, but running out of space on 160Gb Intel SSD (C drive). I also have two 1TB hard drives. Wondering if I can fit a 4th drive (SSD) in this chassis, and which of today's SSDs are compatible with my old hardware and come recommended if I simply replace the old Intel SSD? For example, do I need SATA 3G compatibility?

Thanks,
Bill

Specifications:
Chassis Model: Special Deal Hot Seller - Cooler Master 942 HAF X Exterior Finish: - Standard Factory Finish Trim Accents: - Standard Factory Finish
Processor: Intel Core i7 2600K 3.40GHz (Unlocked CPU for Extreme Overclocking) (Quad Core)
Motherboard: ASUS P8P67 (Intel P67 Chipset) (Features USB 3.0 and SATA 6Gb/s) System Memory: 8GB DDR3 1600MHz Digital Storm Certified Performance Series (Highly Recommended) (Hand Tested) Power Supply: 750W Corsair TX (Dual SLI Compatible) Expansion Bay: - No Thanks Hard Drive Set 1: Operating System: 1x (160GB Solid State (By: Intel) (Model: X25-M MLC Edition) (Extreme Performance) Set 1 Raid Options: - No Thanks Hard Drive Set 2: Multimedia\Data: 1x (1TB Western Digital Caviar (7200 RPM) (64MB Cache) (Model: Black Edition WD1002FAEX) Hard Drive Set 3: Backup\Misc.: 1x (1TB Western Digital Caviar (7200 RPM) (64MB Cache) (Model: Black Edition WD1002FAEX) Optical Drive 1: DVD-R/RW/CD-R/RW (DVD Writer 24x / CD-Writer 48x) Optical Drive 2: - No Thanks Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections) Video Card: 1x NVIDIA GeForce GTX 580 1.5GB (Includes PhysX Technology) Add-on Card: - No Thanks Sound Card: Integrated Motherboard Audio Extreme Cooling: AIR: Stage 2: Noctua NH-D14 Extreme Performance (Does NOT fit on the regular EVGA X58 3X SLI)
H20 Tube Color:- Not Applicable, I do not have a FrostChill or Sub-Zero LCS Cooling System Selected Chassis Airflow: Standard Factory Chassis Fans Internal Lighting: - No Thanks
Enhancements: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
Boost Processor: FREE: Overclock the processor between 3.6GHz to 3.9GHz Boost Video Card: - No Thanks, Please do not overclock my video card(s) Boost Memory: - No Thanks, Please do not overclock my memory Boost OS: - No Thanks, Please do not tweak the services on the operating system Windows OS: Microsoft Windows 7 Home Premium (64-Bit Edition) Recovery Tools: Windows Recovery Toolkit (Bundled with Windows 7 CD) Virus Protection: - No Thanks
Office: - No Thanks
Benchmarking: - No Thanks
Install/Test Game: - No Thanks
Display: - No Thanks
Surge Shield: - No Thanks
Speakers: - No Thanks
Keyboard: - No Thanks
Mouse: - No Thanks
External Storage: - No Thanks
Exclusive T-Shirt: FREE: Digital Storm T-Shirt - Black (Large) Priority Build: - No Thanks, Ship Within 5-15 Business Days After Order Is Successfully Processed
Warranty: Life-time Expert Customer Care with 5 Year Limited Warranty

Yes, you have SATA 6GB, so you should be fine with any internal SSD you want to install. You'd just plug it in to the same cables from the old SSD, but there should be other cabling available. I'm pretty sure DS would include cabling for all the bays, and that case has a bunch.

The preferred unit here would be a Samsung 860 EVO in whatever size you need. Highly reliable and 5 year warranty.