SB2 or wait for NB5?

I am torn between waiting a few more weeks for the nova 5 or splurging on the SB2. I guess i would be considered a larger runner (6'5" 220lbs). I loved the NB3 but the foam was completely dead after 250 miles. I have saucony's speeds but looking for something to just eat up miles more comfortably. I am also usually between a size 13 and 14 so only way the SB2 works is if it runs a bit big. Would the durability and stack of the SB2 serve me better and be more durable given my size?