There aren't many 6-seater planes that can go very far with 5 people on board and get off in 650m. You won't be carrying very much fuel. Still, there are some options.
206 is one. The 210 can just about do it, but has a slicker wing than the 206, so doesn't get off as quick, but a nice tourer. The Lancers/Saratoga can probably do it. A Matrix/Malibu will fit the people, but won't get off in that distance. A Lake Renegade 250 can def do it, but they're rare seabirds in Europe. A Bonanza could probably just about do it.
I'm a high wing dude myself, so I'm biased in this regard - but if you're operating from a grass strip, I'd chose a high wing aircraft myself. A 206 is probably the best choice or if you want to do some serious touring, then the 210. A pressurised P210 is a nice plane to do long IFR touring in. Depends on your needs and how much money you want to spend.