Uplink connections

Hi!

We have a project to upgrade a remote site and I was wondering what would be the best architecture for it.

There are 2 IDFs connecting to a MDF. Each IDF have a stack of 2X C2960-X connected to the Core. Our Core is basically 2X C3850s in HSRP with a layer 3 link between them. First stack will have VLAN 100 and second stack VLAN 200 so no loops.

Now we need to run some fiber between both IDFs to the MDF (length is about 100m). We have 2 options with the contractor, 6 or 12 strands.

Initially I thought :

STACK1 G1/0/49 - - - - - CORE1 G1/0/49

STACK1 G2/0/49 - - - - - CORE2 G1/0/49

STACK2 G1/0/50 - - - - - CORE1 G1/0/50

STACK2 G2/0/50 - - - - - CORE2 G1/0/50

So I would go with 2 runs of 6 strands (much cheaper).

Or should I go with 12 strands and do the following on both stack :

STACK1 G1/0/49 - - - - - CORE1 G1/0/49

STACK1 G1/0/50 - - - - - CORE2 G1/0/50

STACK1 G2/0/49 - - - - - CORE2 G1/0/49

STACK1 G2/0/50 - - - - - CORE1 G1/0/50

I think second option is overkill (over-subscription).

Thoughts?

Thank you!!