Is it a new laptop? if so does it have firewire? in which case in my personal view you can’t go wrong with a firewire outboard device that gives you the best possible input control.
For instance - although I use an M-audio NRV10 in my little studio - it also functions as a good little desk, and allows you to record multiple ‘ins’ that Cubase will identify as separate input ‘tracks’ allowing you to mix in post production
If you mix down straight (I presume) off your PA desk - stereo out, in to a normal soundcard, you would be more restricted.
Hope that helps