[mmcdan]

I think that there are a lot of professional-quality robotics projects that one can do, if you look at specialties that use robots. "Robot" is a loaded term that conjures up generalized images of the stuff you read and see in movies. Look into keywords like "automation", "mechatronics", etc... Examples: Silicon wafer handlers, pick-and-place machines, vacuum cleaners, beer pourers, recycling sorters, package handlers, CNC machines, etc... An especially interesting field is open-source prosthetics.

There are prosumers making these types of robotics projects in their garages/local hackerspaces. There are many online forums where people sharing their builds as well, and many times these builds are actually used in production situations.

Also a high-quality robotics platform in no way needs to cost $1000. If you're on a budget just go to a local hobby shop, spend $100 on a chassis + wheels + motors and order some $0.10 sensors online.