Yeah for 550 dollars that's a steal man. It will run any racing game maxed out. My GTX 560 Ti can still play any racing game maxed.
ASUS P8Z77-V PRO-$220 @ Newegg
Intel i5 3570k-$230 @ Newegg
Corsair TX750-$109 @ Newegg (I'm assuming thats not the modular version because you didn't put a M at the end of TX750)
GTX 660 Ti-$240-350 @ Newegg (There are aftermarket coolers and reference cards so the price can vary. Plus I have no idea which GTX 660 Ti it is because you didn't name the company)
Corsair Vengeance 8GB (4GB x 2)-$60 @ Newegg (I use this ram myself

)
Seagate Barracuda 1TB 7200 RPM-$70 @ Newegg (Personally I use Western Digital cause I find them more reliable but doesn't really matter)
Cooler Master Centurion-$50 @ Newegg (I would get a new one case instead of this if I were you. I would get the HAF 912 if I was in a small budget)
LG DVD Drive-$20 @ Newegg
Total:$999
Is it worth 550? Yes, like I said before it's a damn steal for you.
Notes: The 3570K is Ivy Bridge which is Intel's last gen CPU but it will still be fast as heck. The current CPUs (Haswell) aren't really huge leap in gaming compared to Ivy Bridge so I wouldn't worry about getting a older gen. I'm still rockin my Sandy Bridge (i5 2500K). You might want to check if it comes with a aftermarket heatsink if you plan to overclock. The stock Intel cooler won't get you anywhere. I would recommend a Cooler Master Hyper 212 Evo. It's cheap and effective.
The GTX 660 Ti is also a last gen nVidia card but it's still bloody fast. (I got a GTX 560 Ti) The card should be able to max out any triple A title @ 1080P. Except for Crysis 3 though. The only con I can say about this card is the memory interface. Only 192 Bit which might cripple in a triple monitor setup/surround.
The case. Don't know much about the Cooler Master Centurion but not sure if there is much airflow from what I see. I would upgrade the case if I were you. Maybe to something like a HAF 912 or if you have more money to dish out a HAF 932/NZXT Switch/Storm Trooper and etc etc etc.
You might want to do a bit more homework before you go buy yourself a gaming computer just so that you know what you are doing. Anyways other then that get the computer! It's a freaking steal!
-Tryability