How about a 7/15 watt amp?
+1 for the The Orange Tiny Terror. At 7 watts, this all-tube crunches easily in your bedroom. The warmth and realism coming from this amp is incredible: it can dial minutely to the lowest instance of growl and still have enough gain for metal. You can clean up with your guitar volume knob or, bringing the gain on the amp to 11 o'clock or below, you get a clean, bright, open sound.
The tone control is very subtle; it only cuts and boosts a narrow and particular range, but spread over the entire movement of the knob it makes it capable of great precision.
When switched over to 15 watt, the frequency range seems to open up and only then, in comparison the 7 watt mode sounds vaguely veiled. Otherwise, the same musicality is in both modes.
It comes with a standby mode (flick between 7 and 15 watt) that extends your tubes' lives by letting the amp warm up section by section. After waiting for 30 seconds, Orange says, you may begin play.
It's loud. It can choose to growl early but it can also get very loud, clean. Easily more than enough power for a club setting.