For ongoing purchases I will be using my Plat Amex. It has been the best overall card for me for daily use. It gets you lounge access pretty much anywhere in the world, which makes flying nicer and in the last year has had some GREAT bonuses for transferring miles..... much better than the SPG amex in my opinion. However, it is the sign-up bonuses that give the most bang for your buck. If things change, I will change with it.