Right where were we.

Shw?  You want PSP4?   :)

And Remo, you want an oscilloscope.  :)  It depends what you want to do with it really, as to which one you get.  There's 4 main flavours, that being an analogue scope which is literally volts over time, basically a CRT connected to a timebase.  A digital scope, which is almost the same but has a computer in it and can store things and go back and forth.  An MSO (Mixed Signal) which is digital and has additional LA (Logic Analyser lines in a scope type fashion).  That's what I have.  And finally an LA (Logic Analyser) which is much more advanced than the MSO, but doesn't have the analogue aspect.  

Each has their uses depending on what you want to do.  The Velleman scopes are pretty basic digital scopes with a tiny memory, but are fine for single line fault diagnosis and automotive stuff.  http://i31.twenga.com/3/tp/46/55/6046238802527484655vb.png .  £50 is about the going rate for those 2nd hand.  I almost always buy new though (about £90) unless it's silly cheap.

£80 at Maplin right now; http://www.maplin.co.uk/Module.aspx?ModuleNo=32611&doy=15m2&C=SO&U=strat15 .  They're pretty rubbish though except for anything other than audio signals and basic digital.  It's says 10Mhz but aliasing takes that down to about 2Mhz max.