Re: recomend some speakers for DD 5.1
z5500s are like $150. I don't think you're going to beat that.
Also, why do you need the Dolby Digital? Using normal PC speakers, the analog outputs will likely have more detail. Dolby Digital adds NOTHING, in fact sometimes certain things are lost in the encoding. The analog outs on this card are also clean enough so that sound quality may be higher via analog, as well.
The only thing the DD is useful for is those using an external Home Theater receiver.
Q6600
8GB corsair XMS DDR2
MSI K9N Platinum 780i
2*Evga 8800GT at 650Mhz (factory)
x-fi Platinum
150GB Raptor, 2TB Others
Corsair 650W PSU
Lian Li PC65 case