What software did you used to draw the circuit? (with lcd etc)
Photoshop lol. Have to lift my game there.
As for the Rigol, yes it looks tempting. Still I notice the memory depth in "common" mode (whatever that is) is only 8K. I have a scope which has a memory depth of 2.5K. And really, the low memory depth is what makes it fairly useless for analyzing logic.
If you want to spend more than around $150 I would take a look at the EEVblog review of the new Agilent 2000 series...
(edit) I didn't really mean to have the show appear in the forum posting - I just posted a link. The forum turned it into an imbedded video.
His other stuff (most of which is very interesting is here):http://www.eevblog.com/
Dave Jones' basic point is that the new Agilent series are priced very competitively indeed, especially for a "top" brand (rather than a clone). These scopes have a big memory depth, and a mixed-scope option.
I have to admit the sky is really the limit with scopes, and you can spend $10000+ for one with lots of features.
But a word of warning - my digital scope, which was really quite expensive, is useless for analyzing things like SPI because of the memory size. When it only captures 2500 points, hey, that time might elapse while the switch is debouncing! And remember, the higher the speed, the faster those points get gobbled up! Say you are sampling at 50 Mhz. Right, after only one second, you need memory to save 50M points, right? So if you can only capture 8K points, well that is a tiny fraction of a second.
But the good thing that is coming out of this is that you are thinking of the right questions to ask. The right answers is for you to decide, but at least you know what to look for.