How many channels do you need? The 802X is only $339. Not that I recommend getting less than 4 channels. 😉
Need? Why, I need them all. Desperately. Truly, really, urgently need.
At least, that's what I'm telling my spouse.
More seriously, I've never used a scope with more than 2 channels, but given my interest in microcontroller projects, I can see where the extra channels could be useful. One possible example would be SPI decoding. I haven't ever "needed" that before, but then again, I haven't used SPI that much until recently, and of course haven't ever had any way to check it before. Another possibility could be tracing PWM signals, comparing the output from the microcontroller with the output from an opto-isolator and from the MOSFET to see propagation delay. (Yes, I do understand the last part of that requires careful consideration depending on voltages involved. I learned this the hard way by popping the fuse a couple of times on my old Tektronix scope. Fortunately, it suffered no harm other than the fuse!)