i think 300 us dollars.
but i want a ppc.
i will use a pc hd
a voodo card
memory from pc
i dont kown if i can get a complete good amiga in ebay for better price
somone has to tell me
You can forget about getting all the parts you mentioned for just $ 300,--. Your only chance to get it relatively cheap is buy it secondhand (e-bay, for example). Even then, you will not get it for the amount of money you want to spend on it.
Anyway, your best bet is to buy a complete system. If you buy it bit by bit (like I do), you will probably have exactly the parts you want, but it's gonna cost you at least 4 times as much...