Check out xprotolab (http://www.gabotronics.com/development-boards/xmega-xprotolab.htm) from Gabotronics. Not too fast or too easy to use but it is very capable and Gabo provides very good support. It is self-contained (small oled screen) but can also send info to PC over USB.
Also, the "arduino" teensy 3.1 could be used to make a USB-based scope for ca. $20 (plus some additional parts) and can have a lot of other cool uses too. Check it out: http://www.pjrc.com/teensy/tee... and http://forum.pjrc.com/threads/....
4 wheel drive dowes *not** equal 4 wheel STOP.
And I thought all cars had breaks on all wheels... (4 wheel stop). Was I wrong? Maybe I should check my car again.