So would I be wrong in saying....
Congrats on your recent graduation and new consulting job!
Travel sounds like it

.
I had one of those too.
That sounds reasonable. One thing to keep in mind.. it's likely that your company will have certain rates at different places so while you're planning on HH / Marriott, they might just have a special rate somewhere else.
I'm not familiar w/ the credit card you mentioned, but my advice would be not to jump on getting a new one before you get a feel for your new job and travel patterns. You may find that there are certain things you like / hate, etc.
I think it is smart that you have come up w/ a system, but my one piece of advice would also be to stay flexible. Every frequent flier develops their own preferences so figure out what you like and go for it!