Noobie needs help with graphics card upgrade

Doctor elo

Honorable
Apr 21, 2013
3
0
10,510
So I have been getting very awful framerates for awhile now, and I've tried many things to tweak and slightly improve the framerates, but I think its time for an upgrade. Basically the issue i was having was whenever there was lots of clutter on the screen during gaming, such as Diablo 3 monsters or a teamfight in League of Legends, I would experience drastic FPS drops.

Based on my current specs, what would be the best mix of cost efficiency, being compatible and performance for a new graphics card.

Alienware M17x r3
Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz x8
4gb Ram
GTX 460m (damn this card.. so many issues)

Not sure if i need to include anything else. Thank you guys!

Edit 1:

How much of an upgrade would this be? http://www.ebay.com/itm/NVIDIA-GeForce-GTX-560M-MXM-3-0-DDR5-1-5GB-VGA-Card-GTX-/170877762853?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D14349%26meid%3D7111231913680473116%26pid%3D100005%26prg%3D1088%26rk%3D2%26sd%3D160828920283%26

Am I on the right track here? I need direction!! Value + performance

Thank you!!