Which dev kit for video processing (3G-SDI)

Hi Taz1984 and thanks for your answer !

Yeah indeed it is a full 3G-SDI signal (2.97 Gbits/s bitrates). The thing is I don't really know which development board I should choose or, at least, I don't know if I am thinking the right way for what I am trying to achieve.

For example, there is the "Cyclone IV GX Transceiver Starter Kit". In my opinion, I tihnk this dev kit may be suitable for my project since I need to store at all time 2 frames from my SDI signal to compare them. According to the specs of the 3G-SDI, one frame is 59.4 Mbits. So if I want to compare two successives frames I need, at least, 120 Mbits memory. The specs of this dev kit says it has 16MB flash memory (128 Mbits). It is a bit more than I need but I need to be sure on this point so... am I right if I say that this dev board is not the best choice (not "enough" memory) ? I mean, am I thinking right ?

On the other hand, I have seen a project to process a 3G-SDI signal with a cyclone III based board (DK DEV 3C120N) and a HSMC daughter card (SDALTEVK). There is a thing I just want to be sure. If I understand well, the combination "DK DEV 3C120N (Clycone III) + SDALTEVK (SerDes)" is now "equivalent" with using a Cylcone IV GX since the transceiver is now integrated in the FGPA ?

Thanks !

EDIT: Sorry if it is a stupid question but... where do I plug my BNC cable ? I don't see any BNC connector on the boards for Cyclone IV GX (Shall I have to add a SDI-HSMC card ?)