For home stuff, where how you sound solo is more important than how your sound sits or cuts through in a band situation, I chose to go vintage.
For around £300 you should be able to pick up a WEM Dominator Mk.III, preferably the Dominator 25 model with the 15" Celestion speaker. Classic valve warmth and goodness, seriously old school, looks the business, and will go up in value instead of down.
If there are no Mk.III 25s out there, almost equally good would be a WEM Power Musette ... essentially the same combo but intended for use with an accordion.
Charlie Watkins (the W in WEM) started out making amplifiers for accordions in the 50s, and long after the accordion fad had died a well-deserved death he continued to make combos for them.