[Question about sound cards and Ableton + Mixer]

Hey

I'm a rookie in the dj-ing, but right now, I'm starting on with it.

I bought an Ableton Live, and a Behringer DJX - 700 Mixer.

now, to be able to control 2 or more ableton channels using the behringer mixer, I read I'm going to need an appart audio-interface, like a M-Audio Firewire for example. But that only, costs around 200 Euros.

so, my question is :

if I get myself an appart usb-sound card, and switch it on to my computer, and the use that asio4all driver, would I get the same effect on ableton ? Would I be able to customize those channels ?

thanks in advance

[How can I open .Wav files in Reason?]

Ok, someone told me about ReCycle, but that doesn't make the trick, it says it cannot convert a file that's longer than 5 minutes.

any ideas, because I want to try some remixes at home with reason, been using Ableton up to now...