Wraparound Interfaces Question

Hi, ALL

I have a question about chooseing DDR2 DQ and DQS in banks with Cyclone III device.

I need 64bit DDR2 which means this will take up 4 banks DQ pin of CycloneIII,

The question is WHICH 4 banks should I choose for maximum performance.

I read the External Memory Interface Handbook, Vol.2,Setion 1.1 Wraparound Interfaces, It says the TOP and Bottom side have better timing and Altera can support interfaces with wraparound data groups that wraparound a corner of the device between vertical and horizontal I/O banks at some speeds. Some devices wraparound interfaces are same speed as row or column interfaces.

I am a little confuse about banks choose, Should I choose TOP and Bottom or

TOP and RIGHT? Or there is better solution?

Thanks