I'm jealous. I've always wanted one of the Asus gaming laptops 
Since you are coming from the M50s, you might be disappointed in the A2s. The small drivers won't have any decent bass output. If this is mainly for gaming, I'd consider the Corsair 2.1 set first since it has a sub. If you are into music more and have room for them, I'd pair up larger passive speakers with a Lepai 2020A t-amp. You an get some really good sound that way, and speakers with larger drivers will have better bass, such as Polk Monitor40s or Energy RC-10s
. With either of those, you'll get reasonable mid-bass output down to 60hz or so.