Reddit mentions of The Universal Capper Rigamonti Capper

There are generally two different crown cap sizes - 26mm (American) and 29mm (European). There are plenty of American cideries using 29mm bottles - I always throw those away and keep only the 26mm ones to avoid having that problem (most of the cideries near me are using the same Saint Gobain/Verallia 750mL bottles (example in brown: https://buyourbottles.com/amber-glass-bottles/glass-750ml-celebration ).

Also, this is my favorite crown capper - https://www.amazon.com/Universal-Capper-OJ-NDV7-41ZH-Rigamonti/dp/B007CZI6BG/ref=sr_1_1?ie=UTF8&qid=1482204885&sr=8-1&keywords=italian+crown+capper

It works well on the 750 bottles and leaves a pleasant circular indent in the top.

Swing top bottles

I'm guessing you had the Red Barron. There's others out there, but the market is mostly RB or bench. There are smaller bench cappers out there that might work, but I've also fully invested in swing top bottles because I was so angry my wing capper broke.

Plastic or metal? Usually it's a good idea to have a spare handy, anyway, whether it's yours or just another local brewers. Nothing worse than getting halfway through and realizing you cant bottle. If you want a big jump in quality, get a bench capper. That way you can even do wine bottles if you want. Otherwise, I would recommend an all metal handheld like this

I had one of those "black beauty" cappers, and I never broke a bottle. However, it only lasted about 300 caps before it seemed to have gotten too loose to properly cap.

I got a metal version, link below. It's lasted a long time, and has nylon where it grabs the bottle neck, rather than metal like on the black beauty.

http://www.amazon.com/Rigamonti-FMT_BC_M-Rigamonti-Universal-Capper/dp/B007CZI6BG