If you actually want the amp to be your last one AND work for 30 years with no issues, then you should go with a McIntosh. (this is what Mac does best....Amps!). Just make sure its a newer double balanced design. (lol newer..they have been making these for 15 yrs or more). Today McIntosh makes very expensive quad balanced designs that are high power (500w 1000w 1200w 2000w), so the 200 to 300 watt ones are going to be pre owned like the MC352 350wx2 or MC402 400wx2. Older designs like the MC2255 250wx2 and non Autoformer (direct coupled) designs like the MC7200 200wx2 stay away from. Find one of the amps I mentioned and the sound will be exactly as you described in your post...Big,wide,detailed,warm,no harshness whatsoever, with great low end control, tightness and excellent tonal balance. The journey is half the fun! :-)
Matt M
Matt M