Choosing a digital oscilloscope for a self learner
National Instruments makes great stuff, I used NI products for 20+ years at work, but is a poor choice for a hobbyist. 

IMO, a serious hobbyist should have a stand-alone scope and DMM, not something that attaches to a computer. I have always used Tektronix at work, so I wanted the same for home. I got the TBS1052B for $100 off from Amazon during their holiday sale last year. 

If you aren't tied to one brand, there are many other choices that will give you more features for the same price.