Then go for a Japanese car, as suggested by Abdullah,
I have a very good experience of Japanese cars, regarding your point of parts availability if you buy a Nice car, then it does not need any parts at all (except filters etc which are easily available)
I had Passo 2007, it had a seat height adjuster also, now i have Passo 2011 it also has same, (the immobilizer version has height adjuster, but the simple version does not have)
I have an EK, it also has a seat adjuster.
and i drive all these cars on the lowest height of seat.