So to close the loop, I didn't waste any time. Contacted my repair guy and peppered him with questions on the two Nikons - especially the so-called banding issue. Turns out he has plenty of parts for the LS-8000's and fewer for the LS-9000's. Told me the 8000's and 9000's basically operate the same with the same functionality - with a small difference favoring the 9000, but that the 8000 was the bang for the buck favorite. Checked eBay, the difference between the two units is running close to $1000. So I outbid some folks for an LS-8000 and snagged it. So maybe it will be slower, but the only thing likely holding me back will be my negatives. I'll keep DSLR scanning and getting better at that, but this gives me an option to scan my top negs after initial review, and a 2nd route to getting the best I can manage. Not gonna be the best and not gonna be the quickest, and certainly not going to be the newest tool on the block, but like my Bronica SQ-A, still very good, respectable and capable of delivering the goods. Might even need a tune up. But it just seemed simpler to not fuss around. So the deal is done. Thank you all for your input and encouragement. Another one of those "I'll nevers" has just fallen, and now I have a solid, 20-year-old (?) mid-grade (non-Drum) scanner. Yahoooo! And if I only do 8 negs 10 times a year before it dies in 12 months, it will have paid for itself and given me my money's worth relative to commercial scans.
That V600 at $200 plus is a steal... and if I didn't just want to put these sort of decisions in the rear view mirror... might have gone there.
Again... thanks for the counsel and advice.