I used to run high beams, fog lights, 150w long range, 2 sets of 130w driving lights, and a pair of 55w flood lights at the same time. when idleing it would lag a little bit (12.5v instead of 14), but when driving it was fine. If you plan on using all the lights and doing other battery intensive things I would suggest upgrading. if not you should be fine for the time being.
another option would be a hand throttle, when your parked so you can give your idle a little boost. I found one on quadratec for about $40.