Hello everyone, new to the forum and needing a little help. I bought an old road bike someone converted to single/fixed gear and rode it as a freewheel for about a year pretty casually, then started riding fixed gear and more frequently. Then I broke that frame around the lugs one the tube that the fork stem goes into(not sure what the technical term for that is). I then found another old road frame and built it myself into a fixed gear with a lot of the components from the previous bike and after riding a few months, broke that frame in the same place.

Now my bike has become my only transportation, don't have a car, just ride everywhere. I live in Austin which has okay road surfaces. My daily commute is just over thirteen miles and then there's plenty of extracurricular riding for errands and fun and what not and I'm a fairly big dude, about 6'2 215 lbs. I need a frame that's tough and I can spend 500 on one, I don't care if it's rough riding or whatever, tough is priority number one and then speed is two, I'm not too wealthy and if I drop 500 I can't afford to have it break in two months. Right now the Leader 735 is leading the pack, I like its looks and it seems like a pretty solid frame and I'm just kind of skeptical about thin flexy steel frames after breaking two even though they're supposedly stronger than aluminum (my hardtail mountain bike is aluminum and it's tough as nails). Then the Affinity metropolitan is another I'm thinking about, though the steel thing is holding me back. I'm also even considering going a little deeper for a super pista frame if the extra 250 would mean a significantly more durable frame.

What's everyone's thoughts on this? Which bike do you recommend, honestly I'm leaning pretty hard towards the Leader 735, but I could change if there's a better option.