look up a couple posts and you will see I will give a list of models I like
singer featherweight / 201, 15, 99, 300 - these are old models you can find used at a decent price they will push the thicker threads and they are old school home machines that don't take up alot of room
alot of us use juki ddl series industrial machines or walking foot version of such, I use a singer 591 d300ad (aka juki ddl 5550) it is about 20yrs old nad has fallen out of a truck and still works perfect. if you are only making a bag here and there just get and od singer