Hi Djim,
I have the same old sound card, Audigy 2 ZS, with two hardware synths, only one of which will work without crashing the computer.
The Merlin Vienna SF works well. I used My_Own because it has Real Voice substituted for Synth Voice. You can find My_Own on the same page you downloaded Merlin Vienna from, just a few items on down the list.
http://midi-contest.com/
The only problem I've found with My_Own is that the timpani has D3 (European D2, I think) as the low note. Strange, since the other collections go to the lowest A.
You can get Real Voice separately, as well as the Hagi Flute, at
http://www.sf2midi.com/
Just do a search for "flute" and "voice" or "vocal," then page through the lists.
I just downloaded the Merlin Creative collection and played with it in the Vienna editor. It is the smallest of the soundfont collections at Midi-contest, but it sounds as if it might be good.
Glad you like "Oxen." The Real Voice does make a difference. She has a really nice voice.
all best,
mgj