I've been using a Synology DS1010+ for a few years. They are affordable, easy to setup, and come with a good number of features. There is a VPN server, but there are also a few simpler methods for remote access on the Synology. If you mainly need remote access to data on the Synology, the Cloud Station software is simple and you can work with files offline. They also provide easy to use mobile apps for remote access. Its a good device to keep files on your client machines backed up. If you were comfortable with your dabbling in networking, you'll do fine with a Synology.

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It would be a good idea to determine what kind of skills are in demand where you live, or figure out where you are willing to relocate. I got my RHCE a month ago, and there just doesn't seem to be any demand for that in my area (to be fair I have been casually looking around for only a few weeks). And I am outnumbered in my small IT dept. by MCSEs & MCSDs (2 of each to my 1 RHCE). I'm sure it will be beneficial to me at some point, but I may have to relocate and will definitely have to find new employment to maximize the gain from it.