I've got an NRD 545, and while it is a great radio, for the same money you could get a high end SDR like the netSDR from RF Space, which I also have, and use much more than the NRD 545. Coupled with great software like SdrDx, it's a powerful radio. If you can't hear it with the netSDR and SdrDx, you can't hear it, period.
If you want a lower cost SDR, consider the AFEDRI. I have one as well, and for all the SDRs currently on the market, it probably provides the best bang for the buck on HF and MW. Especially if you get the dual channel version, which allows you do to phasing in software (again via SdrDx), which is a big plus if you are into MW DX. I mostly use the AFEDI on LW now for my nightly DGPS recordings, it also gets use for Europirates on 48 meters as I have the beverage connected to it (which I also use on DGPS, just with a LP filter that blocks MW and above).