I was very happy with my first Integrated Amp, which was my first "big boy" system when I turned 14 back in the mid-'70's -- a Kenwood KA-9100. That amp gave me much joy throughout High School and College. Unfortunately, it was stolen during a home robbery in 1990. I also had a Nakamichi SR2A, which was a very different creature, but I enjoyed the Nelson Pass touch and still have my complete Nakamichi setup (amp, cassette, and CD player).
The Integrated I use now in a bedroom system is a Reisong A10 EL34 Tube amp. Remarkable little beast. Solidly built, nice components, and it only cost me $380 about 5 years ago. Reisong makes some amazing gear.