which cyclone?

I am new to Altera devices. I am trying to decide between Cyclone 3, 4 and 5. But still confused.
My main requirements are -

Number of IOs: Same package/footprint should be available with higher IOs
Power consumption - not a big deal
Long device life: at least 5 yrs before being obsoleted. Preferably 10 yrs.
IOs operating at 3.3V
Application is general purpose logic, no high speed serial stuff.

I am inclined toward Cyclone 5, since it's the newest in the Cyclone family.