So I've ordered the SB6141 and spoke with Time Warner about it after doing so.
They've told me that when I switch to the SB6141, their system will not allow me to use the 300/20mbps "Ultimate" speed provisioning and I will be reverted down to the old 100/10mbps speeds and they will not be allowed to modify that to use the theoretical 300+mbps speed rated on the packaging. Something to do about network saturation and the amount of bonded channels (8 down instead of the needed 16). The guy was pretty nice and he seemed to know what he was talking about (3rd person I spoke to, I assume he was a higher level tech support than the norm).
So, with that information, I've also purchased the CM500-100NAS, which despite it's product ID, does not contain a NAS controller or do anything but route those sweet packets down the cable.
Once I receive the SB6141, I will hook it up and test what the person I spoke to said, and see what kind of speeds I get. If it does indeed bump me back down to 100/10, I'll switch it back until I receive the CM500-100NAS to test it as well.
I'll report back when I have some of my findings once the mail gets delivered.