Thanks @_py , there's so much going on right now, exams and such, that I haven't had the time to be active.
@afiskon , the LimeSDR documentation is not fancy at all because the team hadn't had much time to work on it, but it will get you started and working properly, no worries. If you need more help you can always ask to the LimeSDR community at the MyriadRF's Discourse. Just keep in mind if you intend to use the device for HF bands, you will have to mod it by removing the MN18 coil (aka. Quick/Simple HF Mod 1) (MN18 coil for the RX_1 input, for RX_2 is other coil). There are many people that I know of that have successfully used the LimeSDR. I haven't had the opportunity to use it because mine is only shipping on the 30th of September. The LimeSDR HAS support for OsmoSDR and UHD api's via SoapySDR wich makes it compatible to most of the already written software for SDR devices.
The answer to the question about wich device should you buy to get started with SDR is pretty obvious to me, a $10 RTL-SDR to start and when you get more serious, LimeSDR, a 2x2 MIMO (2 Tx, 2 Rx) with a pretty decent frequency range for only $300? I also have an eye on PandawRF (a upgraded YARD Stick One) and ADALM Pluto. If you have a bigger budget, USRP B-series are also a great option.