I'm in Europe too, and that enter key is horrible. I don't mind it being vertical at all, but in that case it should have been bigger. The way it is now, the top part is only as big as a letter key, while the bottom part is even narrower! That's useless for a key that's used so much.
I love what Apple have done with the Japanese keyboard's enter key (but there the brackets are much worse):
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If I order new I definitely order the US style, but since I often buy refurbs I don't get to have that choice. I tend to buy refurb and then resell them the next year so I'm always only 1 model year behind, I find refurbs keep their value quite well compared to new models.