Upgrade: Graphics card, not sure if compatible

[ja3n]

Hello, bought my PC a few years ago and I'm trying to upgrade the graphics card to something like this. Already have a monitor on the way for the better card

This is my current setup:
ASUS P8Z77-V LE LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

Intel Core i7-3770 Ivy Bridge Quad-Core 3.4GHz (3.9GHz Turbo) LGA 1155 77W Desktop Processor Intel HD Graphics 4000

ANTEC_EARTHWATTS_750_GREEN

CORSAIR Vengeance 4GB 240-Pin DDR3 SDRAM DDR3 1600

Western Digital WD Black WD5003AZEX 500GB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive

EVGA 02G-P3-1559-KR GeForce GTX 550 Ti (Fermi) 2GB 192-Bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Antec 900-2 Case

Not really sure if my setup can just accept any card.. it's been a while since I've upgraded a PC.

Will the motherboard/ram/cpu/powersupply work with a higher end graphics card? If not what else should I get along with the card?

Would it be better to use my old graphics card for my old monitor and the new card for my new monitor? Or just use my new card for both monitors?

Side question: If I were to get a PS4 and wanted to use my PC speakers for it along with my PC what would be an easy solution?

Sorry if I did the formatting wrong or something else, first upgrade post

Thanks

 

[junkeymonkey]

according to antec that psu comes with 4-6+2 pci-e leads so its equipped to do 2 cards with 1 - 6 pin and 1 - 8 pin each or 4 cards with 1 - 6pin

but ... is the unit well built and can hold up to that ?? is it a first tier platform

heres a thread from toms that may help you on this some

http://www.tomshardware.com/answers/id-2078886/gtx-780-antec-earthwatts-750-green-750-watt-psu.html