mikeny :
I'm debating between a Xonar, Forte, or the Titanium. <Just for games> I think that I am going to cave in and get the Z5500's also lol.
I've used the Xonar but have had X-Fi's since their inception...and that's what I'm using now. I like the sound and the driver's interface. The current drivers work well in XP, Vista32&64, and Windows7, IME. I'd recommend the Titanium.
I have the Z-5500's...gave them to my wife. They're fine for personal surround...just don't expect audiophile quality out of them, their pretty directional so they don't really have room filling sound. ...but they are enjoyable and have a lot of bass. I've said it before and I'll say it again...the Z-5500's sub can kill the bacteria on your walls. A lot of fun for gaming, just not the very best for music. They do however, compare fine to other PC speakers and the mini-type receiver offers a lot of utility...and heck, has a DD decoder. Good bang for the buck, just not for the audio purist.