I've used Intel cards with great success in mine. I've used Intel 6230 and 6235 before for dual-band N. Now I'm using a 7260 dual-band AC card. Never had any issues with any of them. And they're not that expensive either. It's a bit of work replacing it though. You need to get under the keyboard.
Asus ROG G55VW:
CPU: i7 3630QM
GFX: Geforce GTX660M with 2GB ram
RAM: 2x8Gb 2133MHz Kingston HyperX Impact (surprisingly the G55VW uses the 2133 X.M.P. profile)
Storage: RAID0 with 2x 256Gb Crucial SSDs (both msata, one in a sata adapter)
OS: Windows 10 x64