My laptop has an i7 4700MQ, GTX 770M, 250gb Samsung EVO SSD plus a 1tb HDD, 8GB G.Skill RAM. Definitely not high end, but it handles everything I throw at it. So, regardless of manufacturer, I would recommend you use my suggestions as a STARTING point. Add RAM and or upgrade to a GTX 780M for even more power. Other improvements can be made at XoticPC or other boutique sellers.
Im looking at one also but I don't need the 780 but will wait until the new Nvidia 800 series. I also want the 256 GB SSD with the 1 TB HD and 16 of ram. I will probable replace the 256 gb in a year with either the 1 tb or the 500 gb. I imagine next year at this time a 1 tb will be in the 300's