I think the Mini interior is kinda cool actually. I mean you gotta remember, it started at like $16K out the door in the US when it first came out. You aren't exactly getting the Phantom here. You can load cars out the yin yang with options, but the interior parts usually reflect most of the base model, no matter the optioned price.
I think the Golf is a nice car. Interior would be nice.
I would finance a car if I could (I wouldn't though, i hate paperwork and bills) to stretch for another $15K if you could do it. You can get tons of awesome cars for $30K. Some with nice design, some with less than nice design but good performance or reliability- at that price, oft times, you must choose which you like more.
For example, if you could buy a $30K car, a CPO Audi A5 would be a good car. Nice design, not the most torturous car to drive (though I think BMWs are infinitely more fun to drive than Audis at those price levels, I'm never buying an Audi again)
For me, I don't really need a car to rely on for daily transport because I plan to live in the city for the rest of my life, but I do want to buy a used 911 when I get settled in in Tokyo. EIther a used 993 Twin Turbo or a newer base Carrera. I am of the opinion that a car is no longer worth me owning unless it's like, a car I will happily remember owning forever even if I don't keep it, a classic that goes down in the ages. And since it's kind of expensive to drive, I figure it better be something more fun and fulfilling to drive than a BMW or a Japanese compact car, even if it's just to the supermarket and back.