Laptop @400-500€ for CAD, Office, Internet (Greece)

Hello guys,

I'm looking for a new laptop for my father. It'll be used mostly for drawing CAD, word/excel etc, and Internet.

The budget starts at 400€, could stretch it to 500€ if necessary.

Interested in a laptop that sports an Intel CPU, i3/i5/i7. Which one is more suitable?

Also, would an integrated gpu like the Intel HD series be up to the task, or is a dedicated nvidia (preferably) needed?

6gb of ram so it can do tasks easily. Are 4gb of ram enough?

Extra HDD slot for future SSD maybe?

I've heard that Lenovo, Dell, Asus and Toshiba have some decent laptops.

What about these?

- Lenovo G5070 (i3-4010U/4GB/1TB/Intel HD) - 385€

- Asus F555LA-XX275H (i3-4030U/4GB/500GB/Intel HD 4400) - 410€

- Dell Inspiron 3542 (i3-4030U/4GB/500GB/Intel HD 4400) - 417€

- Dell Inspiron 3542 (i3-4030U/4GB/500GB/GeForce 820M) - 438€

- Asus F552LDV-SX1001H (i3-4010U/4GB/1TB/GeForce 820M) - 439€

- Toshiba Satellite L50-B-11F (i3-4005U/6GB/750GB/R5 M230) - 449€

- Dell Inspiron 15 3542 (i5-4210U/4GB/500GB/Intel HD 4000) - 450€

- Dell Inspiron 3442 (i5-4210U/4GB/1TB/Intel HD 4400) - 480€

- Dell Inspiron 15 3542 (i5-4210U/4GB/500GB/GT 820M) - 515€

- Dell Inspiron 3542 (i7-4510U/4GB/500GB/GT 840M) - 530€

- Dell Inspiron 15 3542 (i5-4210U/8GB/1TB/GT 820M) - 565€

What do you think about the laptops I posted above? What would you recommend?

I'm open to any other solution.

Thanks for your time!