Right now I'm using a pair of Audio-Technicas ATH-AD700 with my MSI X99A's onboard ALC892 chipset. It's just not very loud. Would an Audigy FX be a good choice? They can be had for ~$20 or so on eBay. I have an old X-Fi Xtreme audio PCI-e sitting here. That one doesn't have a headphone amp, correct? Would it be better than my onboard sound?