Thanks a ton to both of you for your help! Sounds like I ended up on a good thing with my Chase Sapphire card even though I picked it blindly. I didn't even realize the 2x travel points applied to cabs... I definitely need to switch to using that as my everyday card!

I'll have to do some research into the cash back options you mentioned vs. the SPG AmEx. The idea of cash back is incredibly appealing in theory- it seems logical in many ways to get cash back vs. points toward an awesome vacation I don't technically "need." But man... I love awesome vacations