Hi DP!! Welcome Back!!
Okay, given your current system ( Acbel 420 W psu, and a dual core cpu ), it would not make sense to put in a super powerful card, and given your budget of $150 it makes more sense to put in a decent midrange card like the GTX 650 Ti that you mention.
Your Acbel 420 W psu will be strong enough for a card like the GTX 650 Ti, it is strong enough for your current HD 4850 card and I don't think the 650 Ti card draws more power than that card, if it does, it will be a tiny amount more...
The GTX 650 Ti would be ideal for your rig for a number of reasons. This card is nearly as powerful as my own GTX 560 Ti ( people with dyslexia will no doubt get confused reading this post
), their 3DMark 11 scores are close...my card is faster, but not all that much faster...
So the GTX 650 Ti is a great card within your price range. You should be able to play Crysis 3 on medium settings at 1440x900 , you could play higher but your dual core ( not quad core ) cpu will hold you back a wee bit of course, Crysis 3 loves cores...
For example, I am able to play Crysis 3 on High settings at 1600x1200 with only the very odd slowdown in heavy action scenes ( I had it on Very High settings before at 1920x1200 but too many slowdowns during intense action so I had to lower some settings a bit ).
My rig: Q9400 quad oc to 3.35 Ghz, 4 GB DDR-1333 Mhz ( running at that speed ), GTX 560 Ti @ 880 Mhz ( stock is 850 Mhz ).
So based on your rig specs, I am guessing that if you put a GTX 650 Ti card in it, it would be able to handle Crysis 3 at medium settings ( low is for cards like the 7770 etc. ) at 1440x900 or possibly 1600x1200 res...it would still look quite decent at those settings, I tried them out just for fun after installing the game just to see the image quality difference, there is not all that much difference between medium and high tbh , but there is a noticeable iq difference between low and medium... low is not bad, but it does not do the game justice visually...
Here is Crysis 3 benchmarked on midrange graphics cards:
http://www.tomshardware.com/reviews/cry ... 451-5.html
The GTX 650 Ti gets an average frame rate of 33.5 fps, very playable at those settings! ( 1600x1080 High settings , High Texture, 2x SMAA, 8x AF ).
Of course they are using a much faster Intel i7 six-core core cpu in their testbed than your dualcore, but you should expect somewhat similar results even with your dual core as the game is more gpu bound than cpu bound. It will deffo run slower on your system, but not THAT much slower...
Certainly you should have smooth gaming at Medium settings ( perhaps even High ) at that resolution or 1440x900 which still looks "good" tbh...
Here is Crysis 3 running on your cpu at stock speed, and with a much crappier nVidia GT 430 video card!! :
http://www.mytoptrailer.com/show.php?vi ... Ry8&play=1You could expect it to look about twice as good with your overclocked cpu and a sweet GTX 650 Ti card!
Don't forget to play FarCry 3 as well when you get your new vidcard, it is just as beautiful ( or very nearly ) as Crysis 3, and way longer ( single player ) with all kinds of optional side missions...I thought FC3 was a lot more "fun" tbh... Crysis 3 is visually impressive on a high end system but the gameplay is the "same old same old" for the most part, and the single player is the shortest ever!! ( 4 to 5 hours for an expert player to finish it )... FC3 can go on pretty much forever, much better value imho...
You linked to a "faster" version of the GTX 650 Ti coming out to be clocked at 928 Mhz, no need to wait for that cuz you can already buy a faster factory-overclocked version for cheap here! :
http://www.newegg.com/Product/Product.a ... 6814127704MSI Power Edition N650Ti PE 1GD5/OC GeForce GTX 650 Ti 1GB 128-bit GDDR5 PCI Express 3.0 x16 HDCP Ready Video Card
Get $75 value in-game coupon w/ purchase, limited offer
GeForce GTX 650 Ti
Core Clock
993MHz
CUDA Cores
768
$139.99
Save: $20.00 (13%)
$119.99 after $20.00 rebate card
Not bad for $140, only $120 after $20 MIR... MSi make decent video cards...
Not when there is modding to do!! 
