Not sure there is any advantage in selling towers to get bookshelves - they tend to take up the same floorspace plus you need stands. Unless you think you will have too much bottom end with the towers in a smaller space?
There are lots of choices to go with your McCormack (100wpc?). For 6-700 used (+ stands) you are unlikely to beat the NHT considerably - perhaps just something different. I also had Katans, sold them then bought some again. They would be in budget. Maybe Epos M16's. Most of the good stuff will cost a little more used (around $1k).
There are lots of choices to go with your McCormack (100wpc?). For 6-700 used (+ stands) you are unlikely to beat the NHT considerably - perhaps just something different. I also had Katans, sold them then bought some again. They would be in budget. Maybe Epos M16's. Most of the good stuff will cost a little more used (around $1k).