Hey Coolkid, A #3 double long spring (DLS) is a good all around trap for your target critters. Sorry to hear we lost a good hand out here in the Bucking Horse State, you'll be back. Check the sites for some good used ones. You need to mod them up like coils, in my opinion, for those bigger yotes in your country.
Due to the effort, I would recommend A #2 coilspring. You have to do alot of dirtwork for DLSs. I have bout 2 dozen as backup/extras. Usually use them early until I get the hot areas down. You will move 2 or 3 times the dirt for a DLS versus a coilspring. Not to mention I weigh 205, and I have moments that DLS just dont wanna play with me, as far as setting them in the field. If you are investing I would go for coils, and you can buy setters from any supplier to give a feller of your size the leverage to set them.
If I were you I would checkout,
www.schmittent.com, Gerald and Doreen have a great selection and real fair prices. They get ALL of my store bought business. Not to mention Gerald runs monthly specials where you might get a deal. I ordered over $1000 worth of stuff this spring, true to their word, only $22.90 shipping. And Gerald will take a novice's questions and give sound advice, he did with me.
I hope this was a lil help and feel free to ask anytime. I would go small and work your way up, coons are easy and fun. And most foot traps that will hold coon will hold fox and cat.
One last lil bit of advise...They call it checkin' traps, not emptying traps. Good Luck, WyYoteKiller