I'd keep the Mini. The Mas probably has significantly higher running cost(pure speculation). The Mini is plenty of fun, right? You can afford it and living the way you live right now(I'm assuming that you're living comfortably in the middle class).
Honestly, I think the Mini should just as fun, even if it's not as fast. It's fairly quick, it's nimble, it has a manual(yours is a manual, isn't it?) and you don't have to worry about driving to hours for an oil change(why can't you chang it yourself, btw?).
That's just me.
Go n-ithe an cat thu, is go n-ithe an diabhal an cat
When you go Home, Tell them for us and say 'For your tommorrow, We Gave Our Today.'