I don't know if its such a good thing to make price a major issue. I would first go by just sound quality. Many times, you find that what you end up liking can cost a lot less than what you were willing to spend in the first place.
I don't think you can go wrong with a bigger pair of Spendors. With your amp on classical music, I would recommend looking at a pair of Vandersteen's. Either the 2's or 3's, and maybe even a pair of the matching subs. Of all the brands I've tried over the years, I do like Vand. the best. I also had a pair of ProAc Response 2.5's that I thought were excellent, as well. For something very good, but a little different, you may like the sound of a pair of older Martin Logan's. A pair of SL3's should be an excellent match for your amp.
I don't think you can go wrong with a bigger pair of Spendors. With your amp on classical music, I would recommend looking at a pair of Vandersteen's. Either the 2's or 3's, and maybe even a pair of the matching subs. Of all the brands I've tried over the years, I do like Vand. the best. I also had a pair of ProAc Response 2.5's that I thought were excellent, as well. For something very good, but a little different, you may like the sound of a pair of older Martin Logan's. A pair of SL3's should be an excellent match for your amp.