You might consider dropping the VR requirement, especially since budget is an issue. Your biggest challenge in a low light concert environment will be achieving fast enough shutter speeds to freeze subject motion, and VR won't help freeze subject motion.
You'll need an aperture of at least f/2.8 for low light concert photography. And the longer the lens, the more expensive a fixed wide aperture...so you may not find a lens meeting your remaining criteria (good in low light, won't cost body parts, 30-40' working distance). If you drop the 30-40' working distance, your options open up dramatically.
Are you looking at prime or zoom? (Recommend prime. A fast 35mm or 50mm should do the trick.)
Are you open to MF instead of AF? (Should broaden your options substantially, especially with a low budget, and I prefer MF for concert photography, anyway.)