The Gallien Krueger backline stuff is all made in China but unlike other brands which have suffered when they've been moved overseas for whatever reason, Bob Gallien actually oversees a lot of the production so what you get are very good Chinese versions of the American stuff.
eg a Backline 600 is merely a 400RB.
For your budget you're probably going to be looking at the GK backline range, possibly Artist series second hand, Hartke, a Warwick combo?
Markbass, Genz Benz, Schroeder etc do make a lot of high quality, light gear but will be out of your price bracket for now.
There may be others out there that I haven't thought about