I guess that even a 2-channel under 100MHz scope can be quite pricy.
Brand new, yes; you'll be sub-$1000.00 - but generally over $500.00, unless you go with a PC USB scope (and even those can get pricey).
I have been looking at this scope for a while
Something you'll want to do is a lot of research - I don't know anything about that scope, but it looks like a good general purpose or beginner's scope. The fact that it has storage, too is nice; plus the USB interface (wonder what that is about?)...
The bandwidth is kinda on the low side for Arduino stuff (you want something at least 2x - but others say 3-5x - the max frequency in a system you can expect; with an Arduino that can be between 40-100 MHz, depending on who you talk to, etc) - but as long as you aren't trying to scope out super-high-speed signals at the clock rate of the ATMega, it would probably be fine.
I know this is a digital one, but nowadays analog ones are comparable in terms of price and unless you can get a used one from a reliable source, why spend equal amount of money settle on an analog scope?
I went with the Tek scope I did for a variety of reasons - first and foremost was the fact that it was cheap. But right behind that was the fact it was a Tek and had been recently calibrated by them; on a used scope, I would be very wary otherwise (which is why I wouldn't buy one on Ebay, unless I had a way to calibrate it, which requires equipment - a calibration signal generator - that is also very expensive).
For me, it was a "right price, right kind, etc" choice - I couldn't pass it up. It may not have storage capability, or any number of other options that you can find on other digital scopes, but it was better choice for me than spending the same amount of money on what I could get as a USB scope.
I figure that in the future, if I was going to get another scope (if I ever need one), that I would likely go for a BitScope - they are well known as good USB scopes, plus they have drivers for *nix (I think xoscope supports the BitScope) - which is important to me as I don't run Windows (I keep hoping that Saleae will release a *nix version of their system - that's a nice logic analyzer).
Personally, I think it is likely (and if not, you should set one up) that your lab is going to have a PC nearby, so your tools (scope or whatever) should all interface with that PC, if you can afford to set it up this way. That scope you posted might be a good compromise depending on what the USB interface allows.
Oh - one other thing: Having either a digital scope (like you posted) or a PC USB scope (like a BitScope) does have one large advantage over, say, the scope I picked up: Size. My scope is a bench scope, but I don't really have room on my bench for it. I am going to end up building a cart or something for it; its also nice in that it can stand vertical on feet built into the backside (where the z-input and power cord are) - but it would sure be nice if I could have it on my bench. So there's another item to keep in mind...