I've not used the dA print service, so I can't comment on them. I use EZprints (ezprints.com) and have for years. They do great work at low prices. They've been around for a while (anything longer than 1.5 hours is long in internet time
) and originally dealt with photographers only, so they know about printing. Of course, it's a photo-based print method, so you won't get the resolution that you would with a Lambda printer, but it's much less expensive. My images aren't as color-critical as some other folks', so you may want to work with them on color correction if that's important to you.