+1 on Chase Sapphire Preferred
Recently I added Chase Business Ink Bold with 50K bonus.
Earn 5X points per $1 on the first $50,000 spent annually at office supply stores, and on cellular phone, landline, internet, and cable TV services.
I spend about $500 per month on the last 4 categories = $6,000 per year. The 5x bonus adds estimated 24,000 points.