In the mean time, check out the MGL N16 NAV radio and Razor control head. It provides essentially the same functionality as the SL30 but for a lot less money and the radio is remotely installed (Razor in the panel). You can push frequencies from the Dynon SV too. I've done a lot of research and this seems to be the least expensive way (in 2018) to have IFR capability. The VAL Avionics Nav radio is also an option but lacks some of the features of the MGL and SL30.
There are many GPS Navigators on the market today. A GPS "receiver" doesn't get you to IFR anything. The software and databases have to meet vigorous TSO requirements, which is why they are so expensive.