Advice on High Speed DIO

You say you have SPI devices and you "want to interface with them at 150MHz to 200MHz". However, its not up to you, it's up to the devices :)

I have never heard of the SPI bus operating at this clock speed. Do you happen to have part numbers you can reference?

If you need to have a single FPGA that interfaces to multiple high-speed ADCs and DACs, I would recommend considering using an FPGA with SERDES interfaces, and using those to interface to ADCs/DACs that use the JEDEC JESD204A standard, i.e.,

http://en.wikipedia.org/wiki/jesd204

NXP has parts, as do other vendors.

http://www.nxp.com/campaigns/fasttrackyourdesign/index.php?sub=cgv

What sampling frequency were you expecting to operate these devices at?

Cheers,

Dave