Looking to buy a used oscilloscope for builid audio stuff need recommendations

[Cornholio]

I'm looking to buy an oscilloscope for working on solid state and tube audio projects(guitar and hifi related).  What MHZ minimum rating should I be looking for?  Any recommendations would be greatly appreciated.  Other considerations include single vs. dual trace.  Any brand or model recommendations?

What are your thoughts on these two products?

http://www.sparkfun.com/products/10244
http://www.seeedstudio.com/blog/2010/09/18/dso-quad-is-forming-make-a-wish/

I guess my max price range is around $200 U.S.  I've been looking at some on Ebay.  So many variables.  Some of the old ones seem to have really high starting bids.  Too bad oscilloscope prices aren't dropping like widescreen HDTV's.  I realize the above links are cheap 1 channel scopes with VERY limited MHZ ceilings but what actually does one need to analyze audio circuits for guitar amplifiers and home stereo equipment.

Thanks in advance.

[J M Fahey]

1 MHz wideband is 10 times what you really need, so any of them will do.
Incredible products.
Although personally I would much prefer *any* regular scope which I can buy in a garage sale, school old equipment throwaway, pawnshop, etc. with only two conditions:
1) that it works. Even the "easiest" repair is a no no.
2) that it costs less than 200U$, as you stated.