i think the line of least resistence is to stick with the onboard sound and and use the behringer.

i've just ordered a new Soundblaster but have just read the specs that it's PCIe whereas the old card is common or garden PCI so that slot is not available

until i open the case i won't see what slots i've got available because although the motherboard manual gives me a diagram i can't remember what other slots i used for expansion cards