Buy Synology DS918+ or DS1019+ now, or wait a few months for update?

[Enquiries]

Wondering if I should pull the trigger on a top of the line Synology 4-5 bay unit now, or if I should wait for whatever they have coming around the corner assuming I wont have to wait more than a few months. Just don't want to get something now then a nicer model comes out to replace it right away. Thanks for the advice, and keep the content coming