Not to be rude, I have no way of judging your skill level, but are you sure you understand the implications of 20-100khz bandwidth and a tuning range of 1-10mhz? Here is the table at top with the zeta included. I'd _strongly_ recommend going with the rtl-sdr over the zeta as a first radio.
Yes I'd go along with this. You're going to have a plug & play experience more so with the RTL... I guess my interest at the time was transatlantic weak digital signals on HF ham bands. With the RTL-SDR you'll be able to "see" all your favorite radio stations, listen to or track airplanes, and all kinds o things. With an upconverter (~$40) you'll get into HF a bit as well.