Pretty much these:
14"
Asus
K46CB-WX060H, i5-3337U + Nvidia GT740M@RM2199[2kg], 2GB, 750GB, W8, 4-cell, OD

Dell
Inspiron 14R, i5-4200U + Nvidia GT740M@RM1849 [2.32kg], 4GB, 500GB(5400rpm), Linux, 6 cell; W8@RM2049

Lenovo
Z400, i5-3230M + Nvidia GT740M@RM2099, 4GB, 1TB, W8; 2 years warranty; colors: chocolate *EOL-ed

*Prices in RRP, negotiable
*The Lenovo is EOL-ed already, might be a bit hard to find

Spec-wise, all 3 models perform pretty similarly in terms of gaming performance since they all have the same GPU.
CPU-wise, the Lenovo is the most powerful
Warranty-wise, both Lenovo and Asus come with 2 years international warranty. But the latter is known to offer very bad warranty support

Yeah, its a pretty good choice if you are familiar with installing your own OS

But please do check whether the swappable exGPU for the Y400 is the same as the Y410p. If they are not, then please take note and don't buy the wrong one
Can head over to the dedicated Y series thread for more personal feedbacks: https://forum.lowyat.net/topic/2851949

The notebook will have no problems handling two monitors if that's what you are asking
But do expect gaming performance to drop abit at super high resolutions, which can be easily rectified by lowering the resolution. Can refer here for GPU FPS for specific games: http://www.notebookcheck.net/Computer-Game...ds.13849.0.html

Z510 is out already yo
15.6"
Lenovo
Z510T, i5-4200U + Nvidia GT740M + (1366x768, touch)@RM2599[2.2kg], 4GB, 1TB, backlit, W8; 2 yrs
Z510, i5-4200M + Nvidia GT740M@RM2399[2.2kg], 4GB, 1TB, backlit, W8; 2 yrs, color: white