Keep in mind that the decaf process shortens the useful life of the coffee, especially for espresso. I say this after trying numerous decaf coffees (single origins and blends) in a commercial setting. If standard (caffeine) coffees had a good solid useful life of 2-3 weeks, decaf for the most part was along the lines of 8-10 days. The window of opportunity was very narrow with it. Regardless of many storage techniques, etc. I tinkered with it was still very limited.
One thing I also noticed that doesn't seem to be brought up much is to be wary of blended coffees, especially those that are blended after roasting. Different roast levels will mature and become rancid at different intervals and can ruin what would be an otherwise great coffee. For example, my absolute favorite coffee is the Brazil Ipanema that I've mentioned several times which is roasted at two heat levels, then blended after roasting. That particular single origin/blend works and ages very well. Since one of my favorite coffees for drip/press is Ethiopia Sidamo I asked the roaster to blend in a bit of it and possibly balance it with another coffee if needed, which he did. End result was about 60% of the Ipanema, 30% of the Sidamo and 10% of a basic, but dark Sumatra. It was a fantastic blend that worked extremely well for 8-10 days, then the Sumatra began to go rancid due to being quite a bit darker than the other coffees and it simply ruined the entire batch.