Hi, Quadro cards are not suitable for GPU render engines, slow and expensive.
The GTX 760 is a good card but your choice is 2 GB only.
If your scene does not fit in to GPU memory you can´t use it at all.
Here is a spread sheet to compare: http://www.blenderartists.org/forum/attachment.php?attachmentid=340980&d=1414359815
You can look for used GTX 670 4 GB, I saw some for around 160 €.
The next GTX 960 are coming first quarter 2015, the GTX 700 and 600 series are going cheaper then for sure.