Carlos Montes - 2011-07-12

I'm thinking about making a  signal processing project :
(Adquisition + LP digital filter + FFT ) using the XILINX FPGA is on the APF27.
To ease the development I want  to use an existing IP-Core.
I've the ISE WebPack 10.1 installed ¿ Is this correct for IP-Cores ?
I also need some help to get the correct IP cores ( I supose I also need a Mathematical IP-Core to make mults and divs)
Is ther any good documentation on this issue ?
Thanks in advance,