For Asus motherboard, the choices are:
Asus P8Z68-V Motherboard @ 12.6k
Asus Maximus IV GENE-Z @ 12.7k
Asus Maximus IV GENE-Z @ 12.7k would be a better choice if you are more into OCing. Moreover it comes bundled with Kaspersky Antivirus licensed for 1 year. Though you would be loosing Bluetooth (your are supposed to get in Asus P8Z68-V), but for OCers this is very good choice.
For an overall performance you can go with Asus P8Z68-V.
Again changed your mind to 50k+ i hope!!