Nick, it looks like 1" might be a bit much for you from those pictures. If you want to get it right, use a straight edge against the outside of your wheels and tires. Run it up under your wheel well. Then measure the gap between the straight edge (wheel/tire side) and the wheel well at the center top (measure to the inside of the lip - that's where it will rub if you go too large). That is the thickness spacer that you should get.
You can probably get away with 3/16 over (maybe even 3/8 over if you really push it). I went 3/16 over my measurement, and it fits fine. My spacers are 1" and 3/16.
Maximum Motorsports carries quality spacers. You should also consider Eibach or H&R brand spacers. In any case, make sure they are hubcentric. The one's you mentioned from 50Resto.com are not hubcentric.
Don't skimp on quality here. Even a top quality spacer is not that expensive. You don't want a wheel coming off as you cruise down the highway at 80. And also remember to torque em down to spec, and come back a retorque em later. I heard plenty of horror stories about spacers when I was looking into them. Unfortunately, some of those posts were lost in the server burp.
Good luck.