I have had an Eheim 2215 for years and there is nothing fragile about them. Eheim is really going to be one of the best filters you can buy, and you can definitely find cheaper. All filters (AFAIK
) are rated without media, so none of them are going to have exactly the flow that they claim, and Eheim is no exception.
The "classic" series, like the 2215, is something of a pain to clean out, as it does not have trays like othe canister filters, but still I expect this filter to last me 15 years or more, based on their history. That is worth a lot.
I don't have experience with the other filters you are considering, but I also have a Rena Filstar XP3, and I love this filter. It is not expensive but is extremly well made. I think an XP2 would work for you, and not break the bank.