looking at 2 batteries 4S

1. turnigy 4500mah hardcase 138mm long

2 turnigy 5000mah shrink wrapped 149mm?? long

with the 5000 fit in rc8be tray?
anyone use this battery http://hobbycity.com/hobbyking/store...dproduct=14985

i don't have to do ROAR batteries, and 5 bucks extra each i get +500mah and 40C comparted to 4500 30C??? hardcase or softcase???

which one to get??? any 2 cents apprechiated.. thanks