I have dabbled in audio over several decades and am looking for the best oscilloscope for audio measurement and diagnostics for <$300. For this purpose I understand that memory bit depth is more important than high bandwidth. For example a 50MHz or especially a 100MHz bandwidth would be more than adequate, while the Hantek's 48Kpts (24 per channel) may be inadequate for useful fft, especially when trying to measure harmonic distortion. There is a new Rigol DS 1202z for $299 that has 24Mpts of memory.
So my questions are,
1) Are my assumptions correct for the uses I described re: bandwidth and memory?
2) What is the minimum bandwidth and memory I should consider for the uses I described?
3) What other specs should I look for?
4) Can you suggest any specific brand/model that would be particularly well suited for this purpose? I do not want to hook up a box to my computer. My computer stays in the house and my "lab" is in my garage and I can't spend another $1k on another computer.