More than 25k , i spent 17k and still it is lacking, so u need more than 25k with GTX graphics and >8 Gb ram

Minimum of 16,000 br For best performance the Ram have to be 8Gb

For designing its better to have a good performance laptop so you might have to spend more than 18000 i guess, Try to buy Gaming laptops, when a laptop is gaming everything becomes great at performance.