Kosta Zachos:
I'm afraid you'll have to be a bit more specific. Are you talking about assembled ammunition, or just the part that comes out the end of the barrel? Range ammo? Self Defense ammo?
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If you are talking about range ammo, I'd suggest using MagTech FMJ's -- good accuracy, decent price when ordered by the case from Midway USA.
For defense, I'd suggest using those same FMJ's if you have a short barrel. I've got Speer Gold Dots loaded in my Bersa .380. You might also look at the Hornady XTP's, Remington Golden Sabers, and the new CorBon DPX which is just now being released.