The most I would go is $90 , they look to be in really good shape, but them are from the mid to late 90s so check out the surrounds good and make sure they aren't deteriorating and are going to stay together...
I checked on ebay and there is a set for $79 with no bids and a set sold for $50 with $30 shipping a few weeks ago..
The APA150 would be a good match for them though, so you are starting with a good plan..