Which CS Apps will you be using?
Well I do not think you will be satisfied with either for Premiere for HD in a timeline and absolutely no way would you be able to handle any 4K. I am delighted with my laptop with a quad core i7-4700HQ and the nVidia GTX 765M. If as you said just media transfers then it will be fine. Just make sure that Lenovo did not load it with Superfish
Lightroom, Photoshop & Premiere... CS6.
For Lightroom and Photoshop it is OK, for Premiere it is woefully inadequate.
Laptop + 4K footage = 4 core + Hyperthreading + 16GB RAM (minimum requirement)
On top of that, you would benefit massively from having a decent hardware GPU (NVidia) to support 4K real-time playback.
If you think CC_Merchant and I are being hardware snobs, try a test with your desktop set up with only 8GB of RAM, limit your bios settings to 4 cores and no hyuperthreading (similar to 2 cores w/ hyperthreading), and set Adobe to only use software rendering (no GPU) and see if the performance will even "get you by" when traveling.
Your budget does not need to go higher, but you will need to be willing to travel with another 1 or 1.5 lbs to get a decent 14" travel laptop for Premiere Pro.