Suggestions for trees please

Hi
I would like to plant a row of small trees (or large bushes) to screen off the last third of my garden and the houses beyond. They would be planted in raised beds which are two sleepers high and I'd like to use the same trees across the beds so I would probably need at least 4 so they can't be too expensive.
I want something with flowers, good autumn colour, maybe interesting trunks and something that would screen quite quickly but not grow ridiculously tall.
I had considered espalier or pleached but think they would be a) too expensive and b) too difficult to maintain.
As this will be the main view from the house I want to get it right and can't afford to replace them down the line.
I'd appreciate any ideas or suggestions you have.
Thanks!
I would like to plant a row of small trees (or large bushes) to screen off the last third of my garden and the houses beyond. They would be planted in raised beds which are two sleepers high and I'd like to use the same trees across the beds so I would probably need at least 4 so they can't be too expensive.
I want something with flowers, good autumn colour, maybe interesting trunks and something that would screen quite quickly but not grow ridiculously tall.
I had considered espalier or pleached but think they would be a) too expensive and b) too difficult to maintain.
As this will be the main view from the house I want to get it right and can't afford to replace them down the line.
I'd appreciate any ideas or suggestions you have.
Thanks!
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Posts
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Better to choose something that will eventually look good, and plant suitable sized specimens which will grow well.
Amelanchiers would be my choice. Pyrus salicifolius is also nice. Neither are evergreen though, so I don't know if they'd suit.
Viburnum would be good if you wanted evergreen - although not all of them are.
All those are easy to maintain and readily available.
I live in west central Scotland - not where that photo is...