Look into GW Instek scopes also. Made in Taiwan vs made in China. I have a GDS-2204A, 4 channel, 200 MHz. Wide screen, works great.
If you are doing a lot of digital stuff, then a logic analyzer is a great tool.
I have a Saleae Logic 8 channel analyzer. Samples at 24 MHz, useful for SPI running at Arduino 8 MHz max speeds.
If I had bought the scope first, I may have purchased the analyzer plug in for the scope instead.
My son goes to RPI right now, they are using this for lab work
http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,842,1018&Prod=ANALOG-DISCOVERY&CFID=4552925&CFTOKEN=c91d0c73d10d867b-E058B6FB-5056-0201-02AB08FD77C42858
with Lenovo T430 laptops. Each student has their own of each.