Neu 1515 or 1521??

[Purplefade]

OK, thanks to all of your input, suggestions and guidence, I've managed to compile everything I've wanted and needed to build my new Savage but the motor. Originally I was going to go with the Neu 1515 2.5D (1700Kv) on 6\7S A123s. Having continued to read post after post after post, I've noticed and started considering the Neu 1521 1.5D (1860Kv) and the Neu 1521 1Y (1577Kv). Not liking to push my motors to the bleeding edge, I thought the 1521s may offer me some additional over head while running considerably cooler with the right gearing and give me more gearing options as well. Cash not being an obstacle at the moment, let me know your thoughts. I want the best possible option to lug around my heavy weight Savage, reliably without having to wait 20 minutes for cool down between packs

THANKS!!
Purp