I was a long time caffeinated coffee drinker but switched to decaf about a year ago. I have a cappuccino every day in the morning and the coffee beans you use matters a lot. Through trial and error I've found the following ones that are pretty good:
Fresh Roasted Coffee Mexican, Columbian, Sumatra, Peru, and Honduran decaf ones are really good.
Victrola Coffee Deco Decaf
Lavazza Dek
These ones are nasty:
San Francisco Bay Decaf Gourmet Blend
Amazon Fresh Decaf Columbia