You will struggle to get that layout at that price. The nearest you may find with a u shaped dinette would be an older Fleetwood Heritage but the dinette will be in the middle.
Eldiss and Lunar used this layout fairly recently but I doubt you will find one at the price level you are looking at. There was also a Bailey Orion the 440-4 but that was no as upmarket as the other brands. It will still probably be higher than your target figure but if you can find it it will be the nearest I think. You can find details on http://www.baileyorion.co.uk/