The largest wattage panel you'll find @ 12V would be about 135-145 watts each.
Panels with higher output tend to be 24 or 48v.
You do not want to hang a big panel directly on one (or more) batteries - you need a charge controller or you'll FUP your batteries in shots order.
Grid tie? For a couple hundred watts? It's not worth it, the utility pays you at the wholesale rate; it would take over a decade to even get close to any kind of payback, especially when you'd be using a chunk of the power for yourself.
Check out www.wholesalesolar.com; they have packages for on and off grid. I bought a system from the (off grid); their support was excellent in helping to get the right stuff and not buy more than I needed.