Depends on realm, sc/hc, pvm/pvp, d2l/d2r... semi-decked or super-decked.
But about 200 fg would get you far i think. Even the 25 you have could get you a decked out character in the sc realm. Super decked for pvp, you'd probably be looking at 1000+, i mean with top notch gear everything perf etc... gear that you could resell with minor loss.
Get those $$$ out boss ^^ there is no symbol for fg so you can look at those as them ^^