Everyone will have their own preference to how they use their own house, so think carefully about whether a big kitchen/diner or a large lounge with a view over the garden is more important, and don't forget about other rooms that you might find useful, for example, a study, or utility room, or downstairs toilet/bathroom.
My view would be to separate the current kitchen into a study at the front and a utility room at the back (with access to the garage) and maybe a toilet as well (between the two new rooms)
Then the extension I would keep as a single room and use as a large kitchen/diner with maybe a comfy seating area to one side.
Another thing to consider is opening the hallway into the new extension and position a door or window so that you can view the back garden from the front door. You might want to consider the same for the lounge.
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