I have a 2013 specialized sirrus elite and need to replace the crankset (it is trashed and i might as well replace the bottom bracket anyway). Here are the specs off the website:

CRANKSETShimano FC-M391 triple, 9-speed, w/chainguard
CHAINRINGS48/36/26, w/ chainguard
BOTTOM BRACKET Cartridge bearing, square spindle w/ crank stop right side, capless bolts

It is also a 9 speed drivetrain. I am looking to replace it with a crankset with the relatively same gear ratio on the front with a chainguard and a bottom bracket that will work with my bike. I am fairly new to repairing bikes so I am not sure what components to get.

I already have an octalink crank puller and a shimano bottom bracket remover in my wishlist and also have found a cheap crankset on amazon http://www.amazon.com/dp/B003ZMDJW6/...=IFCGRVVD8N1ZQ
I am not sure if this would work with my bike or what bottom bracket would be compatible. Thanks.