Hamhock75's comment is worth considering: when you're toting things from place to place the single box has a lot going for it.
I have an RSPdx and, whilst it's OK, it's finicky to get the RF/IF levels set optimally and it's no star performer in large signal environments. And, if you want to use the LF/MF filters you'll need to use SDRuno - other applications apparently lack the mechanism to turn these on. Still, in expert hands results can be good. With Paul, KM5SW, I recently set an Oceania - North America 136 kHz DX record using VK6MJM (see QRZ); Paul was using an RSPdx, along with a high K9AY loop.
Depending on your listening interests and RFI environment, it'd also be worth trying a small loop. My 1 m diameter Wellbrook LN variety, mounted on a TV antenna rotator about 1.5 m above ground, is excellent from <100 kHz to above 10 MHz, and very usable to >30 MHz.
73, Peter.