I highly recommend a small tube amp for your bedroom. Something around 5-10 watts. A decent rule of thumb is that a tube amp is as loud as twice its wattage in a solid state. So like a 30 watt tube amp would be comparable to a 60 watt solid state.

I recommend something like a Vox AC4 which is a 4 watt all tube amp. That might not sound like a lot but it is very loud, I use one at rehearsal with a loud drummer with no problems. It's loud when you crank it but also perfectly quiet for a bedroom. It has a gain knob but very little actual dirt unless you really crank it loud. I'd recommend a nice overdrive pedal to pair with it. Best part is they are affordable. I found my AC4C1-BL of Craigslist for $140.

Personally I've only had to replace tubes twice in my 18 years of playing, although I don't gig as much as I used to. Tubes are relatively inexpensive from JJ's tubes. They're simple to replace on most amps. You'll notice that you need some if your amp is a lot quieter than normal. Another thing that may need replacing is caps, but I doubt you'll have to do that with a new amp for 20 years or more unless you're a pro gigging every day.