Titan is a rip-off.
You can buy a $500 EVGA 780 (967MHz base) that is FASTER than a Titan. The only difference is the Titan has more RAM . However, try to find me a scenario that you need more than 3GB. If you can, then I suggest maybe a GTX770 4GB SLI setup or an upcoming GTX780Ti 4GB but for the love of money don't spend $2000 on two Titans!
If you've got money to burn, my advice is a monitor with THESE specs once available next year:
- G-Sync
- 2560x1440
- 27"
OR
- G-Sync
- 1920x1080
- 120Hz or 144Hz
- 3D
( you can't get BOTH a high-res monitor and high FPS capable. I choose the larger high-res myself but you may prefer lower-res but 3D and 144Hz capable. Keep in mind 144Hz makes things smoother than 60Hz if you can produce that frame rate but G-Sync smooths things out a lot too so 2560x1440 at 60FPS is pretty great with G-Sync.)
G-Sync:
In Q1 2014 we'll see G-Sync monitors (only Asus?). The technology is truly incredible. You can research that more if you wish. My point is don't get a great monitor now. The experts are really, really impressed. It solves ALL the following issues at the same time which you can't do any other way except with a G-Sync monitor and NVidia card (GTX600/700/Titan).
a) LAG
b) Stutter
c) Screen Tearing.
CPU:
You want the "K" model of the i7 when building an expensive rig or you can't overclock the CPU.
SSD:
Windows should be on an SSD like the 120GB Samsung 840 EVO. You can put your games on the hard drive. My Steam installation is on a 2TB HDD.
PS4:
The PS4 is roughly comparable to a $1000 PC with an HD7950 but I don't want to start a war over this. There are PROS and CONS of course.
The PS4 is inexpensive, "good enough graphics", very quiet for living room and based around the controller. A game like GTAV might look better on a high-end PC but it's still going to look and run very well on the PS4.
GAMES:
Steam offers amazing deals. They are so amazing you might buy too many. The PS4 also has no back-catalogue but Steam has 100's of great games and of course new games will be available too.
I bought Mass Effect 1 for $5 a long time ago and you can find incredible similar deals. In fact, don't spend $60 on a new game. Spend $15 on a nearly new game and buy the NEW game when it's cheaper and has been PATCHED.
SOUND:
People forget about audio. If spending a lot on a PC either get a motherboard like the Asus Maximus Hero IV with SupremeFX audio or invest in a sound card (and good speakers like the M-Audio AV40's).
If using an HDTV it probably doesn't matter as the speakers on pretty much every HDTV are so bad I don't think it matters what audio solution you have.