Lille to Paris is about an hour by TGV, so that's not a bad idea. You could also try Beauvais, closer in but relatively slow connections to central Paris.
That's interesting actually...I looked at Beauvais train times and they are typically an hour and a half to Gare du Nord if I've read the schedule properly. Lille is three times the distance to Paris...just goes to show how much faster the TGV is than a normal train.