I want to get a chase card mainly to transfer points to United miles for our yearly trip to Poland using LOT (Star Alliance). I was thinking of INK which gives 5x rewards at office supply stores (can you buy VR's at staples?). I think I had a sapphire sometime late last year and cancelled it.

This card would most likely replace Penfed for my daily purchases, cell phone bill etc. and just use the penfed for gas.

Any thoughts which would be best?