I'm Ready to go TUBE

After many years of solid state ownership I want to experience the true TUBE sound in my system. At present I have a Mcintosh 2205 amp and a Mcintosh Mx-117. I think I would want to change out the amp first. At present I am running Paradigm studio 80's and Magnepans ever so often. I what to upgrade speakers later as well. My question is what would be a good amp ( vintage or new ) without taking a huge jump in price over what I could get for my Mac say an extra $1000.00 Also, what should I look for in a amp when considering speakers in the future? I listen to blues, R&B and classical.
Thanks in advance,
Dean