New Sound Card - Advice?

[pDc]

I think I need a new sound card.
I need an audio and USB interface(s).

At the moment I have MIDI-IN on my onboard soundcard and MIDI-OUT on my M-Audio Ozone. A terrible setup!
My controller is an 88-Key Fatar keyboard and I have some Access/Roland equipment receiving the MIDI in the end.

It's like:
Fatar Keyboard --in--> Onboard game-port --in--> Cubase --out--> Ozone --out--> Virus

In the Cubase ASIO setup, I can only get high audio latency and large buffer sizes.
Would a nice new sound card help this?
I am not sure if sound cards are supposed to help the cpu with audio processing but if it is, my Ozone sucks at it.

Also, what kind of features should I be looking at for a budget card?
I suspect ASIO 1/2 support is standard now.

And should I want a PCI / Firewire / USB device?

Some budget recommendations would be great if I have not asked for too much already!

Thanks!

Edit: I am on a PC