Look at the ad for the Heresys, He has already done a bunch of Bob Crites mods to them, like 400 bucks worth. Says he replaced both the tweeters and crossovers. So 600 bucks is not a bad deal.
I recently picked up a Set of Heresy's, 1983 in oiled oak for 280.00 in great shape, missing the risers. Added crossover kits myself, about 50 bucks for the parts.
I would still like to upgrade the tweeters. Tweeters with shipping is about 230. Total investment will be 560 by the time I'm done and I'm still missing the risers. So I think that 600 bucks is more than a fair deal.
The only reason I'm hesitant about investing more in these is the resale value. I don't like to go under water when I'm upgrading my audio gear. Seeing someone balk at 600 for those speakers is a perfect example. Now if I had only paid a hundred bucks for them, they would have new tweets in them already.
BillWojo