Browse this list of Internal Sound Cards for specs and get a feel for what you're after:http://www.scorptec.com.au/computer/39/108
I wouldn't go for anything less than EAX 4.0 support in this day and age or anything less than 102dB SNR. (Bearing in mind that a -2.7 to -3.0 dB is twice the noise!).
Does the baseline 'Core 3D' card look much better than what you have?
- Creative Sound Blaster Recon3D PCIe