That 4000 that was mentioned was within your price and it looks like it is in good condition with many questions answered. Tuner aligned. The tuner is probably the most problematic section of any receiver. Some bulbs out shouldn't be a big deal. It's a solid receiver that has a well balanced bass, mid, and treble. A lot of receivers sound good in the upper range but lack the bass. It's a solid recommendation.
From there you can look at others with more questions than you have answers.
The Realistic 860 if it's like some of the later Realistics with the Expander may be of questionable quality. The Expander is a gimmick and probably the worst of their processed sound offerings.
Besides, the receiver, consider the seller feedback, description and packing expertise.
If you are looking at off brand receivers, a Realistic STA-90 is a good value. But make sure the seller gives a good description. Also ask if the pointer turns red when in stereo mode. Meters work, etc.
Don't settle for something less just because it is cheap.