What OS are you planning on running? And, are you going to be running DOS titles as well?
If you're going to be running DOS titles, The SB live and the Audigy 1 can both do DOS emulation. I hear the Audigy 2 can be hacked for it, but I had no such luck.
If you're running Win98, the best card you can buy is an Audigy 2 ZS platinum (there are 98 drivers for it, although when I tried them I had serious issues). Audigy 2 value only has drivers for XP and above. Audigy 1 and lower all have Win98 drivers.
It's not a huge investment to get a SB Live value. There are still mountains of them in OEM anti static bags available for around 10 bucks shipped. Totally worth the step up from on board IMO.
EDIT:
I forgot to add, if you are looking for DOS support, I don't recommend you go totally retro and buy an Awe64. No EAX, it's more CPU intensive than the later stuff, and you're already cpu limited running the V5 5500 with a 1Ghz PIII (though not terribly limited). An Awe64 IS easier to set up with DOS emulation, but I remember years ago now I had a SB live with DOS emu set up just fine and it actually sounded better with analog output than the Awe64 did hooked up via PCM over SPDIF. The only reason to go with the A64 is if you want it for retro chic, or for the sound banks (which I admit I didn't try, perhaps that would make it sound better or equal to the SB Live). If you go for an A64 Gold, also be prepared to shell out the same amount of cash you would for an Audigy 2 ZS (or even a little more). All that said, if you want an A64 for some reason, then go for it. I have an A64 Gold, but that box is for old stuff only (everything else gets run in a wrapper).
If you're going to be running DOS titles, The SB live and the Audigy 1 can both do DOS emulation. I hear the Audigy 2 can be hacked for it, but I had no such luck.
If you're running Win98, the best card you can buy is an Audigy 2 ZS platinum (there are 98 drivers for it, although when I tried them I had serious issues). Audigy 2 value only has drivers for XP and above. Audigy 1 and lower all have Win98 drivers.
It's not a huge investment to get a SB Live value. There are still mountains of them in OEM anti static bags available for around 10 bucks shipped. Totally worth the step up from on board IMO.
EDIT:
I forgot to add, if you are looking for DOS support, I don't recommend you go totally retro and buy an Awe64. No EAX, it's more CPU intensive than the later stuff, and you're already cpu limited running the V5 5500 with a 1Ghz PIII (though not terribly limited). An Awe64 IS easier to set up with DOS emulation, but I remember years ago now I had a SB live with DOS emu set up just fine and it actually sounded better with analog output than the Awe64 did hooked up via PCM over SPDIF. The only reason to go with the A64 is if you want it for retro chic, or for the sound banks (which I admit I didn't try, perhaps that would make it sound better or equal to the SB Live). If you go for an A64 Gold, also be prepared to shell out the same amount of cash you would for an Audigy 2 ZS (or even a little more). All that said, if you want an A64 for some reason, then go for it. I have an A64 Gold, but that box is for old stuff only (everything else gets run in a wrapper).