BAT Vk3i would be well within your budget and would definitely give you the classic tube sound. You may be able to pick up a VK5i for just over $1,700. Both are fully balanced, I believe. If you can stretch your budget a little, the Sonic Frontiers Line 3 is a great unit - it's very transparent and neutral though and may not give you the classic tube warmth that you may be looking for. Good luck.
John.
John.