The more you spend on a spirit level, the more you leave it standing upright and then it falls over with a bang and the vial moves.
I’ve got a nice 1800mm DeWalt one that I look after, but that’s just because I make furniture.
I also have 900mm and 150mm Wickes jobs. I can go all around a room with the 900 and the lines join up. So it’s accurate enough.
Try to get one that you can take the end caps off. They tend to be tapered and make it a pain when you’re going round corners. Also the ones with the sticky out grips on one side so they don’t slide down the wall as you’re scribing can be useful.
I keep thinking about the laser ones, but I already have an investment in metal ones. If I was starting from scratch I might get one.