All eheims come with ehfi medias, Eheim Filter's media. Most of their filters now come with ehfisubstrat pro. If money isn't an issue, I'd go with a pro 3e 2076 or 2078. I run both, and they are a better version of the pro 2s. All three types of filters are top notch though. Between the 2217 and the 2028 you are just looking at convenience. Between the 2028 and 3e you are adding a computer chip, that can adjust the flow, and switch the flow automatically. Regardless of which you choose, you will get a workhorse of a filter.