The 10-22mm is must for me without a doubt. A long lens, anything over say 100mm I use mostly for either wildlife, isolating someone in a portrait (so huge depth of field creating background blur), or when I'm going for a certain look like the Prop in my 'I used to fly' thread I posted today. If all you want is snaps of people and nice landscapes, then you could do without a long lens. However, a long lens can render some very nice landscape/scenery shots as well. I'd be asking yourself if it would hurt to take it if you didn't use it.

Wanting it and not having it is worse than having it and not wanting it.