Out of those cards the 630 is the best. I would only use a lower end card if you were after a display card and quite possibly a card that could do HDCP content ex., blu ray content. Otherwise I would suggest 650Ti, 660, 7770, 7850. You are wasting your money on a lower value card if you are aiming to game if you aren't then a gtx630 could do well for you.
GT 630 is the best card. Well, basing on the options you gave. GT 610 as the slowest. You can play games on GT 630 at 1366 reolution. You may get 20-30 fps. Medium to high settings and depending on the game you want to play
yup graphics card and computer hardware is much more expensive in other countries than usa.. i bought 7750 for $150 for which one can get a 650 ti and the 6670(ddr3) goes for $100 while 630 is about $80.