The
stock Sportster seat sucks, but the
Sundowner (from the HD P&A catalog) is suh-weeet. Beth thought about an 883, but opted for a 1200 in the end. The 883 Custom, 1200 Low and 1200 Custom have 4.5 gallon tanks, the 883 Low, 883 Iron and 1200 Nightster have 3.3 gallon tanks.
The Sportsters are a wee bit top-heavy feeling, more so than the Big Twins. Beth found that for everyday running around, she prefers to not fill the tank all the way (she's got a 1200L - 4.5 tank).
Check if the offer that's available in the States (full price on trade-in, if you trade up to a BT within a year) is available in Europe.
If you buy that Harley, you'll have four parts that I've had a hand in manufacturing; five if you get a BT.
The only Vespa - HD comparison I'll make is resale value. Vespa blows, HD WAY better, at least in the States.
The rest of the comments from people that have had NO experience with an HD should be disregarded.