Which one to choose from asus laptops?

Question

ASUS

Good day! I decided to change my acer aspire v3-551 with 4 gigs of RAM and amd a6, and then the question arose, I want a 17.3 monitor.
I choose from this list:

• Asus (X751Ma)(HD+) Celeron N2830(2.16), 4096, 500, IntelHD, DVD SMulti, WiFi, BT, Cam, Win8.1
• Asus (X751Md)(HD+) Pentium N3530(2.16), 4096, 500, NV GT820M 1Gb, DVD-SMulti, WiFi, BT, Cam, Win8.1
• Asus (X751LD)(HD+) i3 4010U(1.7), 6144, 500, NV GT820M 2Gb, DVD-SMulti, WiFi, BT, Cam, Win8
• HP Pavilion 17-e106sr (HD+) AMD A8-4500M(1.9), 6144, 500, AMD HD8670 1Gb, DVD-SMulti, WiFi, BT, Cam, Win8.1
• DNS (0801484) (HD+) i5 3210M(2.5), 6144, 750, NV GT740M 2Gb, DVD-Smulti, WiFi, BT, Cam

Tell me who can use such units, how do they feel and performance?
Will 4 gigs of RAM be enough? or immediately take 6 gigs?
PS The laptop is purchased for study, layout and design.
UPD: Added 2 options.

Answer 1

Well, celerons and stumps now - it's somehow very sad. 4giga - what do you need? For visual studio or photoshop - not enough. For php in notepad and surfing over the network - quite ok.