Your GT430 is very close to the GTS250 in performance (the GTS250 is very slightly faster). I used to have a GTS250 (before it exploded), and I could run PR on all high with a load of Anti-Aliasing.
Nvidia vs Ati causes such an argument that one thread lasted about a month arguing which card was best, before almost getting locked due to the big fight that developed! It really is down to personal preference, although your GT430, as said above, should be more than enough.
I also recommend you overclock your CPU to 3.0GHz or higher (if you can), as CPU speed plays a big part in most games. Google is your friend.
If you haven't installed PR yet the procedure is:
Install BF2 - Install patch 1.41 - Install patch 1.5 - Install all three PR installers.
After you have it installed, play around on a local co-op (singleplayer) server to get used to the controls/new features, before playing on an online co-op or training server.
Read [url="
https://www.realitymod.com/manual/pr_manual]the manual[/url]; that is a must-do.
And, most of all; Enjoy!