Mazda 6 is a great choice with a petrol engine. A Hyundai i40 or Kia Optima are also big saloons which might be suitable.

Hatchback could work if it has magic seats not sure how common they are now.

Saloon is preferred.

I'm confused by the above two statements?

Any hatchback is more practical than a similar sized saloon (which is your preferred choice), so why would the hatchback need magic seats in order for it to be viable?.

But regardless, magic seats are only really a Honda thing. They moved the fuel tank from under the rear seats (where it is on most cars) to underneath the front seats in order to free up all that space when the rear seat base is flipped up. But AFAIK magic seats only featured in a couple of UK models, the Civic (7th, 8th and 9th gen) and Jazz for sure, possibly the CRV too.

Saloon is preferred. Yes open to SUVs. Want something reliable for long term. Thanks

If long term reliability is high up the list of priorities, a Toyota or Lexus is always worth considering.

The current generation Corolla would be just about be in budget for a 4/5 year old model, as would the C-HR, or the last of the Avensises from 2018 which would be a bit under budget. The Corolla is mostly available as hatchback or estate, though you might find the fairly rare saloon one if you're lucky.

A Lexus IS300h would also be in budget, though would be older and or higher mileage than a similarly priced Toyota.