The Asus ROG Strix GL502VS sits towards the top end of the performance and price scale. It doesn't have any ludicrous dual-GPU setups inside, but its GeForce GTX 1070 discrete graphics chip offers better performance than your typical gaming laptop. It packs a 15.6-inch 1080p G-Sync display and a range of other solid hardware in a relatively portable form factor.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips